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Long-term Debt - Principal Balances under Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Total long-term debt	$ 254,441	$ 248,854
Less current portion	10,000	10,000
Long-term portion	244,441	238,854
Term Loan
Line of Credit Facility [Line Items]
Total long-term debt	90,000	92,500
Revolving Credit Facility
Line of Credit Facility [Line Items]
Total long-term debt	$ 164,441	$ 156,354

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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