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Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Short-term debt:
Bank Credit Facility	$ 38,000	$ 38,000
Long-term debt:
Final Maturity	2015
Long-term debt	199,809	199,744
Total	237,809	237,744
Senior Notes 2015 [Member]
Long-term debt:
Effective Interest Rates	6.10%
Final Maturity	2015
Long-term debt	74,935	74,908
Senior Notes 2016 [Member]
Long-term debt:
Effective Interest Rates	6.90%
Final Maturity	2016
Long-term debt	$ 124,874	$ 124,836

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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