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Combined Guarantor Subsidiaries - Quarterly Information - Summary (Details) - Guarantor Subsidiaries - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue $ 73,803,000 $ 69,328,000 $ 68,868,000 $ 72,991,000 $ 81,241,000 $ 78,655,000 $ 78,591,000 $ 80,438,000 $ 284,990,000 [1] $ 318,925,000 [1] $ 344,057,000
Net income (loss) $ (11,761,000) $ 21,036,000 $ 22,775,000 $ 62,109,000 $ 29,225,000 $ 27,094,000 $ 27,117,000 $ 29,615,000 $ 94,159,000 $ 113,051,000 $ 131,922,000
[1] Sales taxes are excluded from revenues.