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Fair Value of Financial Instruments - Summary of financial assets and liabilities measured at fair value on a recurring basis and fair value hierarchy (Details) - Fair Value, Measurements, Recurring - Other long-term liabilities - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Level 3 | Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ 4,934
Level 2 | Interest Rate Swap Agreements    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements $ 16,731 $ 11,728