Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Recurring Basis (Details)

v3.7.0.1
Fair Value Measurement - Recurring Basis (Details) - Contingent consideration for acquisitions - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Liabilities measured at fair value on a recurring basis    
Balance at beginning of period $ 41,712 $ 39,319
Fair value of contingent consideration at measurement date 4,500 5,000
Change in estimates included in earnings 7,904 (359)
Settlements (7,548) (2,248)
Balance at end of period $ 46,568 $ 41,712