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- Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
$550 million revolving credit facility $ 454,500 $ 358,412
Financing obligation associated with Rocky Top acquisition 0 26,250
Notes payable 836 876
Lease financing obligations 57,792 58,842
Total debt and lease financing obligations 513,128 444,380
Current portion 2,852 8,342
Noncurrent portion 510,276 436,038
Deferred financing fees (4,300) (5,406)
Total $ 505,976 $ 430,632