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Supplemental Financial Information - Supplemental Income Statement, Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
453A interest $ 566 $ 354 $ 1,032 $ 1,145
Interest on RCM6 note payable, related party 0 0 0 263
Credit agreement interest 36 1,215 73 2,112
Other 26 4 216 17
Interest expense $ 628 $ 1,573 $ 1,321 $ 3,537