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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Retained earnings $ 4,052,211 $ 4,052,211     $ 3,509,484
Deferred income tax expense   2,508 $ 32,367    
Effect of Change Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Retained earnings 137,383 $ 137,383   $ 130,700  
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price 99,900        
Contract assets       $ 7,300  
Sales Commissions and Fees 66,400        
Deferred income tax expense $ 42,900