Supplemental Guarantor Information (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011
Supplemental Guarantor Information (Textual) [Abstract]
Principal amount of senior subordinated notes	$ 550.0
Guarantees by subsidiaries	Notes are subordinated to all of our senior debt and the senior debt of our subsidiary guarantors, including our Senior Secured Facility
Description of priority	Notes rank equal in right of payment with any of our future senior subordinated debt
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Subsidiary guarantors owned by the issuer	100.00%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Discussion of whether the debt instrument is secured or unsecured, and, if secured, a description of the collateral and guarantees required or provided.

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- Definition

Description of the debt instrument's priority, or seniority, for repayment in relation to other obligations of the entity in the event of liquidation.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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