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Information Concerning Guarantor and Non-Guarantor Subsidiaries - General Information (Details)
9 Months Ended
Sep. 30, 2018
USD ($)
entity
Dec. 31, 2017
USD ($)
Condensed Financial Statements, Captions [Line Items]    
Number of wholly owned subsidiaries | entity 4  
Ownership percentage in subsidiaries (as a percent) 100.00%  
Senior Notes [Member] | $350 Million 5% Senior Notes [Member]    
Condensed Financial Statements, Captions [Line Items]    
Face amount $ 350,000,000 $ 350,000,000
Stated interest rate (as a percent) 5.00%  
Senior Notes [Member] | $400 Million 5% Senior Notes [Member]    
Condensed Financial Statements, Captions [Line Items]    
Face amount $ 400,000,000 $ 400,000,000
Stated interest rate (as a percent) 5.00%