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Debt Obligations (Summary Of Credit Facilities And Related Information) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Debt Obligations [Abstract]
Letters of credit outstanding	$ 4,785	$ 4,911
Borrowings
Interest expense (including commitment and letter of credit fees)	1,302	818	1,168
Amortization of issuance costs	$ 725	$ 1,570	$ 878

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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