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Long-Term Debt and Credit Facility (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 44,041us-gaap_LongTermDebt	$ 62,105us-gaap_LongTermDebt
Less current portion of long-term debt	(18,643)us-gaap_LongTermDebtCurrent	(26,415)us-gaap_LongTermDebtCurrent
Long-term debt, less current portion	25,398us-gaap_LongTermDebtNoncurrent	35,690us-gaap_LongTermDebtNoncurrent
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	8,500	16,272
Term loan [Member]
Debt Instrument [Line Items]
Long-term debt	$ 35,541	$ 45,833

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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