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Long-Term Debt (Principal Balances under Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total long-term debt	$ 256,828	$ 237,566
Current portion of long-term debt	10,000	10,000
LONG-TERM DEBT	246,828	227,566
Term Loan [Member]
Debt Instrument [Line Items]
Total long-term debt	97,500	100,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 159,328	$ 137,566

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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