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Long-term Debt - Principal Balances under Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Total long-term debt	$ 212,878us-gaap_LongTermDebt	$ 224,490us-gaap_LongTermDebt
Less current portion	10,000us-gaap_LongTermDebtCurrent	10,000us-gaap_LongTermDebtCurrent
Long-term portion	202,878us-gaap_LongTermDebtNoncurrent	214,490us-gaap_LongTermDebtNoncurrent
Term Loan
Line of Credit Facility [Line Items]
Total long-term debt	72,656	82,500
Revolving Credit Facility
Line of Credit Facility [Line Items]
Total long-term debt	$ 140,222	$ 141,990

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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