Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits
Balance at beginning of year	$ 71,458	$ 89,767	$ 124,728
Increases from prior period positions	510	88	528
Decreases from prior period positions	(9,711)	(15,145)	(31,470)
Increases from current period positions	5,052	6,001	5,951
Decreases relating to settlements with tax authorities	(2,626)	(4,844)	(6,953)
Reductions from lapse of applicable statute of limitations	(4,381)	(4,409)	(3,017)
Balance at end of year	$ 60,302	$ 71,458	$ 89,767