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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Jun. 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 $ 41,448   $ 74,203
Affect on deferred income taxes as a result of adoption of new accounting guidance (127,774)   (137,638)
Affect on retained earnings as a result of adoption of new accounting guidance $ 2,203,473   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