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Debt Schedule of Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 103,578	$ 92,814
Credit agreement
Debt Instrument [Line Items]
Long-term Debt	68,578	57,814
Senior notes
Debt Instrument [Line Items]
Long-term Debt	$ 35,000	$ 35,000

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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