Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 139,249	$ 132,495	$ 172,594
Increases from prior period positions	0	7,637	9,090
Decreases from prior period positions	(21,207)	(16,753)	(33,692)
Increases from current period positions	10,867	23,533	17,704
Decreases relating to settlements with tax authorities	(1,791)	(3,831)	(22,127)
Reductions from lapse of applicable statute of limitations	(2,390)	(3,832)	(11,074)
Balance at end of year	$ 124,728	$ 139,249	$ 132,495