Income Taxes - Changes in Unrecognized Tax Benefit (Including Interest and Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	$ 13,778	$ 14,139	$ 12,683
Additions for tax positions for current year	5,051	3,712	4,171
Additions for tax positions for prior years	2,989	889	1,454
Reduction for tax positions for prior years	(799)	(1,408)	(2,108)
Lapse of the applicable statute of limitations	(1,423)	(2,395)	(521)
Reduction as a result of settlement	(1,327)	(1,159)	(1,540)
Ending Balance	18,269	13,778	14,139
Reconciliation of Unrecognized Tax Benefit
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	12,612	12,689	11,505
Additions for tax positions for current year	5,051	3,712	4,171
Additions for tax positions for prior years	1,765	63	631
Reduction for tax positions for prior years	(730)	(884)	(1,865)
Lapse of the applicable statute of limitations	(1,100)	(1,826)	(435)
Reduction as a result of settlement	(1,108)	(1,142)	(1,318)
Ending Balance	16,490	12,612	12,689
Interest and Penalties
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	1,166	1,450	1,178
Additions for tax positions for current year	0	0	0
Additions for tax positions for prior years	1,224	826	823
Reduction for tax positions for prior years	(69)	(524)	(243)
Lapse of the applicable statute of limitations	(323)	(569)	(86)
Reduction as a result of settlement	(219)	(17)	(222)
Ending Balance	$ 1,779	$ 1,166	$ 1,450