Acquisitions - (Details)	Mar. 09, 2017 USD ($) employee	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill		$ 855,330,000	$ 738,453,000
L2, Inc.
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Entity number of employees | employee	150
Business combination, consideration transferred	$ 155,000,000
Aggregate purchase price	134,200,000
Net cash paid for acquisition	129,300,000
Contingent consideration arrangements, maximum value (up to)	$ 20,800,000
Contingent consideration arrangements, maximum value, period of expense recognition	3 years
Goodwill	$ 124,700,000
Business combination, amortizable intangible assets recognized	9,500,000
Business acquisition, goodwill, expected tax deductible amount	$ 0