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Business Segment Information - Reconciliation of Reportable Segment Amounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Segment operating income $ (1,850) $ (4,612) $ (5,561) $ (7,945)  
Corporate payroll and benefits (2,033) (3,956) (4,215) (7,759)  
Corporate rent and occupancy (255) (632) (300) (1,026)  
Corporate legal and professional fees (1,219) (1,982) (2,254) (4,965)  
Corporate general and administrative (809) (1,346) (2,072) (2,092)  
Corporate depreciation and amortization (118) (223) (600) (454)  
Other income (expense), net 7 (279) 16 2,680  
Income tax expense (3,642) (99) (9,028) (152)  
Net income 6,408 7,860 15,096 12,236 $ 97,700
Operating Segments          
Segment Reporting Information [Line Items]          
Segment operating income 13,020 16,317 28,318 28,761  
Segment Reconciling Items          
Segment Reporting Information [Line Items]          
Corporate payroll and benefits (1,343) (2,866) (3,153) (5,912)  
Corporate rent and occupancy (91) (272) (117) (501)  
Corporate legal and professional fees (1,129) (1,982) (2,127) (4,909)  
Corporate general and administrative (797) (1,373) (1,656) (2,146)  
Corporate depreciation and amortization (51) (128) (258) (258)  
Corporate interest (expense) income, net (59) (1,214) (283) (2,121)  
Other income (expense), net 500 (523) 3,400 (526)  
Income tax expense $ (3,642) $ (99) $ (9,028) $ (152)