Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Effective Income Tax Reconciliation (Details)

v3.8.0.1
Income Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Computed expected tax benefit $ (39,616) $ (24,206) $ (23,155)
State and local income taxes, net of federal income taxes 2,032 2,047 1,556
Change in valuation allowance affecting income tax expense 39,499 26,892 24,149
Expense (income) not resulting in tax impact 1,211 (1,585) (155)
Tax amortization of indefinite-lived assets 4,001 4,000 3,890
2017 Federal tax reform enactment (9,020)    
Other, net 0 0 5
Total Income tax expense (benefit) $ (1,893) $ 7,148 $ 6,290