Business Segment, Product and Geographic Information (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	$ 215,104	$ 192,383
Property and Equipment, Net	152,988		$ 141,441
UNITED STATES
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	188,351	169,926
Property and Equipment, Net	124,229		113,037
International [Member]
Revenues and Net Property and Equipment by Geographical Areas [Line Items]
Revenue	26,753	$ 22,457
Property and Equipment, Net	$ 28,759		$ 28,404