Income Taxes - Changes In Gross Liability For Unrecognized Tax Benefits Excluding Interest And Penalties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of period	$ 61,411	$ 72,230
Increase in unrecognized tax benefits for tax positions taken in a prior period	1,067	940
Decrease in unrecognized tax benefits for tax positions taken in a prior period	(5,608)	(9,783)
Increase in unrecognized tax benefits for tax positions taken in the current period	4,576	3,355
Statute lapses	(325)	0
Settlements with taxing authorities	(1,009)	(5,331)
Unrecognized tax benefits, end of period	$ 60,112	$ 61,411