Income Taxes - Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the federal statutory tax rate to the Company's effective tax rate
Federal statutory tax rate (as a percent)	21.00%	21.00%	35.00%
State and local income taxes (as a percent)	6.00%	26.60%	0.90%
Change in valuation allowance (as a percent)	(22.50%)	9.50%	(0.70%)
Permanent items (as a percent)	2.30%	27.90%	(2.70%)
Tax audit adjustments (as a percent)	0.90%	8.70%
Change in uncertain tax positions (as a percent)	0.20%	5.50%	(0.30%)
Tax credits (as a percent)	(0.10%)	(5.60%)	0.10%
State tax rate change effect on deferred balance		27.70%	(0.20%)
Federal statutory tax rate change effect on deferred balance (as a percent)			(45.00%)
Goodwill impairment (as a percent)			(21.10%)
Other (as a percent)	1.90%	(1.70%)	(1.30%)
Tax provision (as a percent)	9.70%	119.60%	(35.30%)