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Condensed Consolidating Financial Information - Narrative (Details)
Mar. 31, 2018
Debt Instrument [Line Items]  
Percentage of subsidiary owned 100.00%
Senior Notes | 6.00% Senior Notes, due 2026  
Debt Instrument [Line Items]  
Notes bear interest at a rate 6.00%
Senior Notes | Senior Notes Due 2023  
Debt Instrument [Line Items]  
Notes bear interest at a rate 5.125%
Senior Notes | 5.875% Senior Notes due 2024  
Debt Instrument [Line Items]  
Notes bear interest at a rate 5.875%
Senior Notes | 5.875% Senior Notes due 2022  
Debt Instrument [Line Items]  
Notes bear interest at a rate 5.875%