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Long Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 241,435us-gaap_LongTermDebt	$ 215,575us-gaap_LongTermDebt
Current portion of long-term debt	1,234us-gaap_LongTermDebtCurrent	1,140us-gaap_LongTermDebtCurrent
Long-term debt	240,201us-gaap_LongTermDebtNoncurrent	214,435us-gaap_LongTermDebtNoncurrent
Revolving Line of Credit [Member]
Debt Instrument [Line Items]
Total long-term debt	235,000	208,000
Mortgages Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 6,435	$ 7,575

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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