Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Revenue Recognition Narrative (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES Revenue Recognition Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Oct. 01, 2015
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]            
Deferred revenue   $ 0     $ 31,047 $ 24,243
Minimum            
Schedule of Equity Method Investments [Line Items]            
Service agreement period 1 month          
Service agreement cancellation period 30 days          
Hospital service agreement termination period 2 years          
Maximum            
Schedule of Equity Method Investments [Line Items]            
Service agreement period 5 years          
Service agreement cancellation period 90 days          
Hospital service agreement termination period 5 years          
Aeroleo | Variable Interest Entity, Not Primary Beneficiary            
Schedule of Equity Method Investments [Line Items]            
Percent of economic interest     50.00%      
Percent of voting interest     80.00%      
Equity Method Investee | Aeroleo | Aeroleo            
Schedule of Equity Method Investments [Line Items]            
Deferred revenue       $ 42,100