Property And Equipment Property And Equipment (Property And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 86,699	$ 66,709
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(55,499)	(47,110)
Property and equipment, net	31,200	19,599
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	79,576	61,471
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,405	1,300
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,718	$ 3,938