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Income Tax (Reconciliation of the Amount of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits Beginning balance, January 1 $ 297,290 $ 296,213 $ 274,661
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions 247,596 226,720 26,170
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions (246,894) (229,719) (7,820)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions 36,438 4,186 3,396
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities (13,206) (110) (194)
Unrecognized Tax Benefits Ending balance, December 31 $ 321,224 $ 297,290 $ 296,213