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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of long-term debt
Total long-term debt	$ 250,000	$ 250,000
Less current portion
Long-term debt, net of current portion	250,000	250,000
5.375% Notes, due Oct. 2020 [Member]
Summary of long-term debt
Total long-term debt	250,000	250,000
Revolving credit facility, due Nov. 2016 [Member]
Summary of long-term debt
Total long-term debt

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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