Income Taxes - Changes In Gross Liability For Unrecognized Tax Benefits Excluding Interest And Penalties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of period	$ 60,112	$ 61,411
Increase in unrecognized tax benefits for tax positions taken in a prior period	1,649	1,067
Decrease in unrecognized tax benefits for tax positions taken in a prior period	(12,560)	(5,608)
Increase in unrecognized tax benefits for tax positions taken in the current period	3,092	4,576
Statute lapses	0	(325)
Settlements with taxing authorities	(1,696)	(1,009)
Unrecognized tax benefits, end of period	$ 50,597	$ 60,112