Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ 0	$ (1,101)
Foreign	(3,599)	(3,023)	(1,731)
State and local taxes	(3,186)	(2,583)	(2,317)
Current income tax expense (benefit)	(6,785)	(5,606)	(5,149)
Deferred:
Federal	(1,495)	6,249	(75,928)
Foreign	7,321	1,290	1,631
State and local taxes	7,585	(2,730)	(280)
Deferred income tax expense (benefit)	13,411	4,809	(74,577)
Income tax expense (benefit)	$ 6,626	$ (797)	$ (79,726)