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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Assets	$ 4,797,083		$ 4,350,900
Net income	33,190	$ 35,103
Net cash from operating activities	$ 83,030	59,638
Senior Notes | 9.00% Senior Notes Due 2020
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	9.00%
Parent
Debt Instrument [Line Items]
Assets	$ 4,209,561		$ 3,643,330
Net cash from operating activities	$ (35,967)	(26,888)
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	$ 4,658,967		$ 4,565,001
Net cash from operating activities	86,355	75,990
Non-Guarantor Subsidiaries (100% Owned)
Debt Instrument [Line Items]
Assets	1,441,686		1,452,324
Net cash from operating activities	32,735	5,730
Non-Guarantor Subsidiaries (Not 100% Owned)
Debt Instrument [Line Items]
Assets	221		221
Net cash from operating activities	0	(41)
Eliminations
Debt Instrument [Line Items]
Assets	(5,513,352)		$ (5,309,976)
Net cash from operating activities	$ (93)	$ 4,847

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