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Debt (Summary Of Credit Facilities And Related Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Debt [Abstract]
Letters of credit outstanding	$ 4,535		$ 4,785
Borrowings
Interest expense (including commitment and letter of credit fees)	322	321
Amortization of issuance costs	$ 181	$ 181

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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