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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 06, 2016	Mar. 28, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Assets	$ 4,456,654				$ 4,350,900
Net income	405,783	$ 54,103
Net cash from operating activities	256,906	241,449
Parent
Debt Instrument [Line Items]
Assets	4,608,732				$ 3,643,330
Subsidiaries, Ownership Percentage				100.00%
Net cash from operating activities	$ (87,625)	(38,073)
Parent | Senior Notes | 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			9.00%		9.00%
Parent | Senior Notes | 6.875 % Senior Notes Due 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%				6.875%
Parent | Senior Notes | 6.375% Senior Notes Due 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Guarantor Subsidiaries
Debt Instrument [Line Items]
Assets	$ 5,392,472				$ 5,878,690
Net cash from operating activities	309,530	281,845
Non-Guarantor Subsidiaries (100% Owned)
Debt Instrument [Line Items]
Assets	477,592				92,402
Net cash from operating activities	26,251	(16,309)
Non-Guarantor Subsidiaries (Not 100% Owned)
Debt Instrument [Line Items]
Assets	0				$ 221
Net cash from operating activities	$ 0	$ (78)

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