Income Taxes (Schedule 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
Balance at beginning of period	$ 8,214	$ 4,325	$ 4,145
Changes in tax positions of prior years	0	480	114
Additions based on tax positions related to the current year	1,720	4,288	802
Closure of tax years	(1,013)	(879)	(736)
Balance at end of period	$ 8,921	$ 8,214	$ 4,325