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Long-Term Debt (Debt Outstanding) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total	$ 161,250us-gaap_LongTermDebt
Current portion of term loan and revolving loan	(6,875)us-gaap_LongTermDebtCurrent	(6,250)us-gaap_LongTermDebtCurrent
Long-term debt	154,375us-gaap_LongTermDebtNoncurrent	141,250us-gaap_LongTermDebtNoncurrent
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total	65,000
Medium-term Notes [Member]
Debt Instrument [Line Items]
Total	$ 96,250

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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