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Debt Obligations (Schedule of Long Term Obligations) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
May 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total long term obligations $ 365,098   $ 317,658
Less: current portion (41,637)   (33,865)
Total long term obligations, net $ 323,461   283,793
Unsubordinated term loan and Revolving credit facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Collateral, Coverage Percentage 150.00%    
Unsubordinated term loan [Member]      
Debt Instrument [Line Items]      
Total long term obligations $ 93,067   100,708
Revolving credit facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Accordion Feature Amount   $ 100,000  
Total long term obligations 240,000   180,000
Aircraft loans [Member]      
Debt Instrument [Line Items]      
Total long term obligations $ 32,031   $ 36,950