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Supplemental Financial Information - Supplemental Income Statement - Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
453A interest $ 2,490 $ 4,639 $ 3,371
Interest on RCM6 note payable, related party 263 2,468 2,245
Credit agreement interest 1,884 1,180 0
Other 429 115 109
Interest expense $ 5,066 $ 8,402 $ 5,725