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Recent Accounting Pronouncements (Cumulative Effect of Change to Balance Sheet) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Prepaid income taxes $ 61,222 $ 43,741 $ 44,944
Deferred income tax assets 19,995 28,150 26,976
Customer deposits and deferred revenue (short-term)   46,508  
Income taxes payable 47,777 15,810 15,773
Deferred income tax liabilities   21,496  
Retained earnings 1,772,941 1,444,473 1,443,867
Accumulated other comprehensive loss $ (144,409) (77,334) (77,344)
Before Adoption of Standard      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Prepaid income taxes     44,944
Deferred income tax assets     26,976
Customer deposits and deferred revenue (short-term)     47,324
Income taxes payable     15,773
Deferred income tax liabilities     21,362
Retained earnings     1,443,867
Accumulated other comprehensive loss     $ (77,344)
Adoption of Standard | ASC 606      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Deferred income tax assets   (55)  
Customer deposits and deferred revenue (short-term)   (816)  
Income taxes payable   37  
Deferred income tax liabilities   134  
Retained earnings   590  
Adoption of Standard | ASU 2018-02      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Retained earnings   (10)  
Accumulated other comprehensive loss   10  
Adoption of Standard | ASU 2016-16      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Prepaid income taxes   (1,203)  
Deferred income tax assets   1,229  
Retained earnings   $ 26