Long-Lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Summary of Property and Equipment
Property and equipment, gross	$ 148,274	$ 176,391
Less—accumulated depreciation	(112,282)	(138,065)
Property and equipment, net	35,992	38,326
Computer equipment
Summary of Property and Equipment
Property and equipment, gross	$ 70,408	96,749
Computer equipment | Minimum
Summary of Property and Equipment
Property and equipment, useful lives	3 years
Computer equipment | Maximum
Summary of Property and Equipment
Property and equipment, useful lives	5 years
Leasehold improvements
Summary of Property and Equipment
Property and equipment, gross	$ 15,226	16,566
Leasehold improvements | Minimum
Summary of Property and Equipment
Property and equipment, useful lives	5 years
Leasehold improvements | Maximum
Summary of Property and Equipment
Property and equipment, useful lives	10 years
Operating equipment
Summary of Property and Equipment
Property and equipment, gross	$ 53,494	55,501
Operating equipment | Minimum
Summary of Property and Equipment
Property and equipment, useful lives	3 years
Operating equipment | Maximum
Summary of Property and Equipment
Property and equipment, useful lives	8 years
Furniture and fixtures
Summary of Property and Equipment
Property and equipment, useful lives	8 years
Property and equipment, gross	$ 9,146	7,531
Capital projects in process
Summary of Property and Equipment
Property and equipment, gross		$ 44