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Fair Value Measurements (Details) (USD $)	3 Months Ended
Fair Value Measurements (Details) (USD $)	Mar. 31, 2015 business	Dec. 31, 2014	Mar. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Number of completed acquisitions	1us-gaap_NumberOfBusinessesAcquired
Carrying value of outstanding debt	$ 213,600,000us-gaap_LongTermDebt	$ 213,600,000us-gaap_LongTermDebt
Senior Subordinated 6.25% Notes
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Carrying value of outstanding debt	$ 210,000,000	$ 210,000,000
Senior Subordinated Notes, interest rate	6.25%		6.25%

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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