Segment Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 349,254	$ 328,415	$ 995,343	$ 967,243
United States
Segment Reporting Information [Line Items]
Revenue	274,506	270,512	799,696	793,904
Canada
Segment Reporting Information [Line Items]
Revenue	30,233	29,559	92,253	94,817
Other Regions [Domain]
Segment Reporting Information [Line Items]
Revenue	$ 44,515	$ 28,344	$ 103,394	$ 78,522