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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Affect on other current assets as a result of adoption of new accounting guidance $ (51,451)   $ (74,203)
Affect on deferred income taxes as a result of adoption of new accounting guidance (131,149)   (137,638)
Affect on retained earnings as a result of adoption of new accounting guidance $ (2,276,634)   (2,057,915)
Accounting Standards Update 2018-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Results of adoption of new accounting guidance     0
Accounting Standards Update 2018-02 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Results of adoption of new accounting guidance     6,435
Accounting Standards Update 2016-16      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Results of adoption of new accounting guidance     (645)
Affect on other current assets as a result of adoption of new accounting guidance   $ 7,300  
Affect on deferred income taxes as a result of adoption of new accounting guidance   6,700  
Affect on retained earnings as a result of adoption of new accounting guidance   $ 600  
Accounting Standards Update 2016-16 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Results of adoption of new accounting guidance     (645)
Adjustments for New Accounting Pronouncement | Accounting Standards Update 2018-02 | Retained Earnings      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Results of adoption of new accounting guidance     (6,400)
Adjustments for New Accounting Pronouncement | Accounting Standards Update 2018-02 | AOCI      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Results of adoption of new accounting guidance     $ 6,400