Condensed Consolidating Financial Information (Narrative) (Details) - Senior Notes - USD ($)	Jan. 27, 2017	Dec. 31, 2016	Aug. 30, 2016	May 09, 2016	Aug. 30, 2014	Apr. 15, 2014	Feb. 28, 2013	Jan. 31, 2013
7.75% Senior Secured Notes Due 2021
Condensed Financial Statements, Captions [Line Items]
Principal amount		$ 835,000,000		$ 235,000,000		$ 150,000,000	$ 450,000,000	$ 835,000,000
Interest rate			7.75%	7.75%	7.75%	7.75%	7.75%	7.75%
Subsequent Event | 6.125% Senior Secured Notes due 2025
Condensed Financial Statements, Captions [Line Items]
Principal amount	$ 850,000,000
Interest rate	6.125%