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Debt (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
	Dec. 31, 2011	Mar. 31, 2012 2011 Term Loan [Member]	Dec. 31, 2011 2011 Term Loan [Member]	Mar. 31, 2012 2011 Term Loan Agreement [Member]
Debt Instrument [Line Items]
Term loan outstanding				$ 198,500
Interest rate on notes payable				LIBOR plus 2.75%
Interest rate on notes payable in addition to LIBOR	2.75%			2.75%
Weighted Average Interest Rate		3.75%	3.75%
Interest rate on notes payable				Interest rate floor of 1.00%
Floor rate of LIBOR				1.00%
Base Rate and Margin		1.75%

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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