Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Company Borrowings (Details)

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LONG-TERM DEBT - Company Borrowings (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 07, 2012
Debt Instrument [Line Items]      
Principal balance on borrowings $ 208,446,000 $ 236,376,000  
Portion due with one year (2,736,000) (2,139,000)  
Unamortized debt issuance costs (2,067,000) (2,395,000)  
Unamortized discount (1,469,000) (1,703,000)  
Long-term debt (including $1,903 and $2,767 from VIEs in 2017 and 2016, respectively) 202,174,000 230,139,000  
7.750% Senior Notes (excluding unamortized discount)      
Debt Instrument [Line Items]      
7.750% Senior Notes (excluding unamortized discount) 144,828,000 144,828,000  
Senior secured revolving credit facility      
Debt Instrument [Line Items]      
Principal balance on borrowings 39,000,000 65,000,000  
Promissory notes      
Debt Instrument [Line Items]      
Principal balance on borrowings 21,642,000 23,166,000  
Other      
Debt Instrument [Line Items]      
Principal balance on borrowings $ 2,976,000 $ 3,382,000  
Senior Unsecured Notes Due December 15, 2022 | 7.750% Senior Notes (excluding unamortized discount)      
Debt Instrument [Line Items]      
Stated interest rate 7.75% 7.75% 7.75%
Principal balance on borrowings     $ 200,000,000.0