Income Taxes (Schedule of Changes in 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]
Total amounts of unrecognized tax benefits, beginning of period	$ 26,841	$ 24,247	$ 21,417
Gross (decreases) increases in unrecognized tax positions as a result of tax positions taken during a prior period	(1,755)	(276)
Gross (decreases) increases in unrecognized tax positions as a result of tax positions taken during a prior period			2,991
Gross increases in unrecognized tax positions as a result of tax positions taken in the current period	4,199	4,083	461
Decreases in unrecognized tax positions relating to settlements with taxing authorities	(6,446)	0	0
Decreases in unrecognized tax positions as a result of a lapse of the applicable statutes of limitations	(355)	(1,213)	(622)
Total amounts of unrecognized tax benefits, end of period	$ 22,484	$ 26,841	$ 24,247