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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Assets	$ 4,829,320		$ 4,350,900
Net income (loss)	63,212	$ 28,678
Net cash from operating activities	$ 160,261	155,776
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	$ 4,297,214		$ 3,643,330
Net cash from operating activities	$ (59,978)	(40,933)
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	$ 4,817,123		$ 4,671,506
Net cash from operating activities	158,742	150,591
Non-Guarantor Subsidiaries (100% Owned)
Debt Instrument [Line Items]
Assets	1,428,872		1,452,324
Net cash from operating activities	57,119	36,811
Non-Guarantor Subsidiaries (Not 100% Owned)
Debt Instrument [Line Items]
Assets	221		$ 221
Net cash from operating activities	$ 0	$ (70)

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