Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 46,703	$ 51,271	$ 45,012
Increases related to tax positions during a prior year	3,952	5,285	2,508
Decreases related to tax positions taken during a prior year	(245)	(7,441)	0
Increases related to tax positions taken in the current year	4,299	4,069	3,751
Settlements	(5,627)	(5,831)	0
Decreases related to expiration of statute of limitations	0	(650)	0
Ending balance	$ 49,082	$ 46,703	$ 51,271