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Long-Term Debt (Principal Balances under Long Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total long-term debt	$ 254,254	$ 237,566
Current portion of long-term debt	10,000	10,000
LONG-TERM DEBT	244,254	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	$ 156,754	$ 137,566

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.16)

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-Name Regulation S-X (SX)

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-Name Accounting Standards Codification

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-Section S99

-Paragraph 1

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Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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- Definition

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+ References

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-Publisher FASB

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-Topic 210

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-Section S99

-Paragraph 1

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