Segment Information (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 336,606	$ 299,356	$ 638,828	$ 574,210
Other Segments
Segment Reporting Information [Line Items]
Revenue	29,799	17,200	50,178	32,307
United States
Segment Reporting Information [Line Items]
Revenue	271,375	243,128	523,392	471,962
Canada
Segment Reporting Information [Line Items]
Revenue	$ 35,432	$ 39,028	$ 65,258	$ 69,941