Business Combinations, Goodwill and Intangible Assets Business Combinations, Goodwill and Intangible Assets - Additional Information - SCIO (Details) - SCIO - USD ($) $ in Thousands		9 Months Ended
	Jul. 01, 2018	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Purchase consideration	$ 245,491
Total purchase price	$ 245,491
Customer relationships
Business Acquisition [Line Items]
Weighted average useful life	10 years
Developed technology
Business Acquisition [Line Items]
Weighted average useful life	5 years
Trade names and trademarks
Business Acquisition [Line Items]
Weighted average useful life	3 years
Restricted Stock
Business Acquisition [Line Items]
Stock issued during period (in shares)	69,459
Restricted Stock Units
Business Acquisition [Line Items]
Restricted common stock issued for acquisition of SCIO	$ 4,080	$ 4,080	$ 0
Minimum
Business Acquisition [Line Items]
Purchase consideration	236,500
Revolving Credit Facility
Business Acquisition [Line Items]
Utilized revolver credit facility to finance acquisition	$ 233,000