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Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term debt, Carrying Value	$ 624,984,000us-gaap_LongTermDebt	$ 629,756,000us-gaap_LongTermDebt
Contingent consideration	0	27,378,000
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Long-term debt, Fair Value	659,445,000	658,306,000
Contingent consideration - long-term, Fair Value		$ 27,378,000

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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