Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits
Balance at beginning of year	$ 89,767	$ 124,728	$ 139,249
Increases from prior period positions	88	528	0
Decreases from prior period positions	(15,145)	(31,470)	(21,207)
Increases from current period positions	6,001	5,951	10,867
Decreases relating to settlements with tax authorities	(4,844)	(6,953)	(1,791)
Reductions from lapse of applicable statute of limitations	(4,409)	(3,017)	(2,390)
Balance at end of year	$ 71,458	$ 89,767	$ 124,728