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Debt Obligations (Tables)
6 Months Ended
Jun. 30, 2016
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long term obligations consisted of the following (in thousands):
 
 
June 30,
 
December 31,
 
2016
 
2015
Unsubordinated term loan
$
93,067

 
$
100,708

Revolving credit facility
240,000

 
180,000

Aircraft loans
32,031

 
36,950

Total long term obligations
365,098

 
317,658

Less: current portion
(41,637
)
 
(33,865
)
Total long term obligations, net
$
323,461

 
$
283,793