Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits
Balance at beginning of year	$ 60,302	$ 71,458	$ 89,767
Increases from prior period positions	2,147	510	88
Decreases from prior period positions	(47)	(9,711)	(15,145)
Increases from current period positions	3,472	5,052	6,001
Decreases relating to settlements with tax authorities	(12,508)	(2,626)	(4,844)
Reductions from lapse of applicable statute of limitations	(3,302)	(4,381)	(4,409)
Balance at end of year	$ 50,064	$ 60,302	$ 71,458