Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Valuation allowance	$ 36,000		$ 37,345	$ 1,189
Valuation allowances	35,800		36,224	0	$ (45,354)
Deferred Tax Assets, Other Comprehensive Loss	$ 200
Reduction in valuation allowance					45,400
Provision income tax expense related to deferred tax asset		$ 8,000	0	0	8,011
Unrecognized tax benefits		3,807	5,792	5,412	3,807	$ 5,180
Unrecognized tax benefits, which would affect the effective tax rate		4,000	6,000	5,600	4,000
Decrease in interest and penalties accrued					200
Unrecognized tax benefit accrued interest and penalties		200	300	300	200
U.S.
Income Tax Contingency [Line Items]
Federal, state and foreign net operating loss carryforwards			80,700
State
Income Tax Contingency [Line Items]
Federal, state and foreign net operating loss carryforwards			132,800
Other Current Liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits		100		100	100
Other Noncurrent Liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits		$ 500	$ 700	$ 600	500
Net Operating Losses | U.S.
Income Tax Contingency [Line Items]
Reduction in valuation allowance					(15,700)
Net Operating Losses | State
Income Tax Contingency [Line Items]
Reduction in valuation allowance					(4,400)
Other Net Deferred Tax Assets
Income Tax Contingency [Line Items]
Reduction in valuation allowance					$ (25,300)