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Debt Obligations (Tables)
6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long term obligations consisted of the following (in thousands):
 
 
June 30,
 
December 31,
 
2017
 
2016
Unsubordinated term loan
$
78,030

 
$
85,636

Revolving credit facility
445,000

 
355,000

Aircraft loans
5,255

 
18,085

Total long term obligations
528,285

 
458,721

Less: current portion
(20,133
)
 
(29,306
)
Total long term obligations, net
$
508,152

 
$
429,415