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Business Segment Information - Reconciliation of Reportable Segment Amounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Total reported segment operating income $ (5,262) $ (2,913) $ (4,612) $ (3,311) $ (7,135) $ (9,989) $ (17,778) $ (6,898) $ (16,098) $ (41,800) $ (41,814)
Corporate payroll and benefits                 12,390 23,589 20,767
Corporate rent and occupancy                 2,168 3,309 2,468
Corporate legal and professional fees                 8,293 16,604 14,430
Corporate general and administrative                 3,721 6,104 6,066
Corporate depreciation and amortization                 979 2,019 1,865
Corporate interest (expense) income, net                 268 24 74
Other income (expense), net                 2,463 494 26
Income tax benefit (expense) 61,673 (583) (99) (53) 131 (44) (63) (44) 60,938 (20) (296)
Net income (loss) $ 75,830 $ 9,612 $ 7,860 $ 4,376 $ (2,908) $ (8,654) $ (12,447) $ (6,132) 97,678 (30,141) 1,387
Operating Segments                      
Segment Reporting Information [Line Items]                      
Total reported segment operating income                 58,598 4,548 28,746
Segment Reconciling Items                      
Segment Reporting Information [Line Items]                      
Corporate payroll and benefits                 (9,415) (14,842) (12,621)
Corporate rent and occupancy                 (1,187) (707) (694)
Corporate legal and professional fees                 (8,230) (15,199) (9,514)
Corporate general and administrative                 (3,811) (3,640) (3,980)
Corporate depreciation and amortization                 (608) (578) (354)
Corporate interest (expense) income, net                 (2,334) 24 74
Other income (expense), net                 3,727 273 26
Income tax benefit (expense)                 $ 60,938 $ (20) $ (296)