Segment Information (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 309,042	$ 302,222
United States
Segment Reporting Information [Line Items]
Revenue	252,199	252,018
Canada
Segment Reporting Information [Line Items]
Revenue	28,406	29,825
Other Regions [Domain]
Segment Reporting Information [Line Items]
Revenue	$ 28,437	$ 20,379