Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Schedule of Contingent Consideration Rollforward (Details)

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Acquisitions - Schedule of Contingent Consideration Rollforward (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Deferred Cash and Stock Obligations    
Deferred Cash and Stock Obligations Beginning Balance $ 47,016 $ 14,150
Additions, net of fair value discount 25,709 42,104
Cash payments (26,734) (8,215)
Accretion expense 1,491 1,049
Change in fair value 0 0
Indemnification claims and other adjustments (2,753) (2,072)
Deferred Cash and Stock Obligations Ending Balance 44,729 47,016
Contingent Consideration    
Contingent Consideration Beginning Balance 414 541
Additions, net of fair value discount 7,000 812
Cash payments (247) (700)
Accretion expense 0 0
Change in fair value (167) (239)
Indemnification claims and other adjustments 0 0
Contingent Consideration Ending Balance 7,000 414
Total    
Total Beginning Balance 47,430 14,691
Additions, net of fair value discount 32,709 42,916
Cash payments (26,981) (8,915)
Accretion expense 1,491 1,049
Change in fair value (167) (239)
Indemnification claims and other adjustments (2,753) (2,072)
Total Ending Liability $ 51,729 $ 47,430