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Assets and Liabilities Measured at Fair Value - Level 3 Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of the period $ 26,500 $ 274,300 $ 25,400 $ 269,722
Payment of contingent consideration in cash 0 (10,000) 0 (10,000)
Changes in fair value during the period, included in statement of operations 300 1,050 1,400 5,628
Balance, end of the period $ 26,800 $ 265,350 $ 26,800 $ 265,350