Segment Information - Schedule of Fixed Assets, Goodwill and Intangibles, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Long-lived Assets	$ 78,377				$ 63,557				$ 78,377	$ 63,557
Intangible Assets, Net (Including Goodwill)	929,830				942,683				929,830	942,683
Revenue	390,442	$ 349,254	$ 337,047	$ 309,042	359,013	$ 328,415	$ 336,606	$ 302,222	1,385,785	1,326,256	$ 1,223,512
United States
Segment Reporting Information [Line Items]
Long-lived Assets	67,617				52,305				67,617	52,305
Intangible Assets, Net (Including Goodwill)	736,334				798,746				736,334	798,746
Revenue									1,103,714	1,085,051	993,474
Canada
Segment Reporting Information [Line Items]
Long-lived Assets	5,887				6,817				5,887	6,817
Intangible Assets, Net (Including Goodwill)	121,987				122,821				121,987	122,821
Revenue									124,101	129,039	150,390
Other Geographical Location
Segment Reporting Information [Line Items]
Long-lived Assets	4,873				4,435				4,873	4,435
Intangible Assets, Net (Including Goodwill)	$ 71,509				$ 21,116				71,509	21,116
Revenue									$ 157,970	$ 112,166	$ 79,648