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Debt Obligations (Tables)
3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long term obligations consisted of the following (in thousands):
 
 
March 31,
 
December 31,
 
2017
 
2016
Unsubordinated term loan
$
81,765

 
$
85,636

Revolving credit facility
415,000

 
355,000

Aircraft loans
11,652

 
18,085

Total long term obligations
508,417

 
458,721

Less: current portion
(26,531
)
 
(29,306
)
Total long term obligations, net
$
481,886

 
$
429,415