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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Effective Income Tax Rate Reconciliation, Penalties

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Income Taxes - Income Tax Expense (Benefit) at Company's Effective Tax Rate (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (109,060)	$ 12,681	$ (51,926)	$ 28,965	$ 6,905	$ 120,818	$ 238,571	$ 46,524	$ (119,340)	$ 412,818	$ (35,451)
Tax provision at statutory tax rate of 35%									(41,769)	144,486	(12,408)
Effect of:
Goodwill impairment									28,794	0	0
State and local income tax									(1,649)	12,828	(1,266)
Permanent acquisition costs									0	0	610
Contingent earn-out payments									0	1,680	0
Penalties									5,140	202	(89)
Other									472	155	(164)
Total income tax expense (benefit)	$ (65,087)us-gaap_IncomeTaxExpenseBenefit	$ 83,484us-gaap_IncomeTaxExpenseBenefit	$ (38,997)us-gaap_IncomeTaxExpenseBenefit	$ 11,588us-gaap_IncomeTaxExpenseBenefit	$ (2,892)us-gaap_IncomeTaxExpenseBenefit	$ 48,129us-gaap_IncomeTaxExpenseBenefit	$ 95,339us-gaap_IncomeTaxExpenseBenefit	$ 18,775us-gaap_IncomeTaxExpenseBenefit	$ (9,012)us-gaap_IncomeTaxExpenseBenefit	$ 159,351us-gaap_IncomeTaxExpenseBenefit	$ (13,317)us-gaap_IncomeTaxExpenseBenefit