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Borrowings (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 115,592	$ 88,173
Unsecured Term Loan Due April 2018	30,000	0
December 2014 3.62% [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 59,444	$ 62,000

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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