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Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Short-term debt:
Bank Credit Facility, expires October 6, 2015	$ 38,000	$ 38,000
Long-term debt:
Long-term debt	199,907	199,874
Total	237,907	237,874
Senior Notes 2015 [Member] | Senior Note 6.05 % [Member]
Long-term debt:
Long-term debt	74,976	74,962
Senior Notes 2016 [Member] | Senior Note 6.85 % [Member]
Long-term debt:
Long-term debt	$ 124,931	$ 124,912

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- Definition

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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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Carrying amount at the balance sheet date of borrowings from a bank, not elsewhere enumerated in the taxonomy, with a maturity within one year (or within one operating cycle if longer) from the date of borrowing.

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