Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidating Financial Information (Narrative) (Details)

v3.7.0.1
Condensed Consolidating Financial Information (Narrative) (Details) - Senior notes - USD ($)
Dec. 21, 2016
Oct. 31, 2016
Oct. 14, 2016
Apr. 21, 2015
Aug. 18, 2014
7.75% Senior Notes due 2020          
Condensed Financial Statements, Captions [Line Items]          
Debt instrument, amount         $ 600,000,000.0
Amount validly tendered   $ 600,000,000.0      
6.625% Senior Notes due 2023          
Condensed Financial Statements, Captions [Line Items]          
Debt instrument, amount       $ 350,000,000.0  
6.000% Senior Notes due 2024          
Condensed Financial Statements, Captions [Line Items]          
Debt instrument, amount     $ 650,000,000.0    
6.375% Senior Notes due 2025          
Condensed Financial Statements, Captions [Line Items]          
Debt instrument, amount $ 600,000,000.0