Business Segment, Product and Geographic Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	$ 239,649	$ 200,538	$ 690,963	$ 595,831
Property and Equipment, Net	179,913		179,913		$ 141,441
UNITED STATES
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	208,281	176,371	597,230	524,320
Property and Equipment, Net	145,359		145,359		113,037
International [Member]
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	31,368	$ 24,167	93,733	$ 71,511
Property and Equipment, Net	$ 34,554		$ 34,554		$ 28,404