Segment Information - Schedule of Fixed Assets, Goodwill and Intangibles, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Long-lived Assets	$ 63,557				$ 60,240				$ 63,557	$ 60,240
Intangible Assets, Net (Including Goodwill)	942,683				937,494				942,683	937,494	$ 800,595
Revenue	359,013	$ 328,415	$ 336,606	$ 302,222	339,911	$ 309,391	$ 299,356	$ 274,854	1,326,256	1,223,512	1,062,478
United States
Segment Reporting Information [Line Items]
Long-lived Assets	52,305				48,884				52,305	48,884
Intangible Assets, Net (Including Goodwill)	798,746				759,035				798,746	759,035
Revenue									1,085,051	993,474	870,525
Canada
Segment Reporting Information [Line Items]
Long-lived Assets	6,817				7,099				6,817	7,099
Intangible Assets, Net (Including Goodwill)	122,821				154,349				122,821	154,349
Revenue									129,039	150,390	135,630
Other Geographical Location
Segment Reporting Information [Line Items]
Long-lived Assets	4,435				4,257				4,435	4,257
Intangible Assets, Net (Including Goodwill)	$ 21,116				$ 24,110				21,116	24,110
Revenue									$ 112,166	$ 79,648	$ 56,323