Quarterly report pursuant to Section 13 or 15(d)

BASIS OF PRESENTATION AND ACCOUNTING POLICY Narrative (Details)

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BASIS OF PRESENTATION AND ACCOUNTING POLICY Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Nature of Operations and Accounting Policies [Line Items]            
Deferred revenue $ 37,084 $ 32,666 $ 31,047 $ 28,477 $ 26,469 $ 24,243
Debt issuance cost 3,700   $ 4,000      
Aeroleo            
Nature of Operations and Accounting Policies [Line Items]            
Deferred revenue $ 37,100