| INCOME TAXES Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | 
|---|---|---|
| Deferred tax liabilities: | ||
| Property and equipment | $ 242,977 | $ 232,835 | 
| Buy-in on maintenance contracts | 1,443 | 1,990 | 
| Other | 0 | 1,692 | 
| Total deferred tax liabilities | 244,420 | 236,517 | 
| Deferred tax assets: | ||
| Equipment leases | 224 | 355 | 
| Tax loss carryforwards | 34,674 | 18,964 | 
| Stock compensation | 2,131 | 0 | 
| Reserves | 1,452 | 0 | 
| Other | 2,042 | 0 | 
| Valuation allowance | (21,575) | (12,650) | 
| Total deferred tax assets | 18,948 | 6,669 | 
| Net deferred tax liabilities | $ 225,472 | $ 229,848 | 
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- Definition Deferred Tax Liabilities, Other, Buy-in on Maintenance Programs No definition available. 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- References No definition available. 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment. No definition available. 
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- References No definition available. 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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