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Debt Schedule of Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Debt	$ 455,000	$ 452,502
Current portion of debt	15,000	15,000
Long-term debt	440,000	437,502
2011 Senior Secured Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Debt	170,000	160,000
2011 Senior Secured Credit Facility [Member] \| USD Denominated Term Loan [Member]
Debt Instrument [Line Items]
Debt	$ 285,000	$ 292,502

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. 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, and after deducting unamortized discount or premiums, if any.

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