Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Taxes
Effective tax rate (as a percent)	38.50%	4.20%	38.30%	2.90%
Income tax provision (benefit)	$ 9,679,000	$ (15,272,000)	$ 18,795,000	$ (10,496,000)
Impairment charge		376,574,000		376,574,000
Income taxes
Adjustment related to a favorable state audit settlement and state tax attributes			(400,000)
Adjustment related to discrete items		0
Adjustment mainly related to stock based compensation items				3,600,000
Total amount of unrecognized tax benefits, including related interest and penalties	4,100,000		4,100,000
Unrecognized tax benefits	3,900,000		3,900,000
Amount of Interest	200,000		200,000
Maximum decrease in unrecognized tax benefits within the next twelve months due to the settlement of audits or the expiration of statute of limitations in various jurisdictions			100,000
Maximum
Income taxes
Adjustment related to a favorable state audit settlement and state tax attributes	$ 100,000

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Represents the gross amount of maximum decrease in unrecognized tax benefits resulting from settlements with taxing authorities or lapses of the applicable statutes of limitations.

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No definition available.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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No definition available.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to differences in the deductibility of incentive stock options and other equity-based compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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- Definition

The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the current period and the expected income tax expense or benefit computed attributable to revisions of previously reported income tax expense.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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