Business Segment, Product and Geographic Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	$ 236,210	$ 202,910	$ 451,314	$ 395,293
Property and Equipment, Net	171,291		171,291		$ 141,441
UNITED STATES
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	200,599	178,023	388,949	347,949
Property and Equipment, Net	136,816		136,816		113,037
International [Member]
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	35,611	$ 24,887	62,365	$ 47,344
Property and Equipment, Net	$ 34,475		$ 34,475		$ 28,404