Properties and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Land	$ 3,726	$ 3,646
Buildings and Improvements, Gross	15,526	15,084
computer equipment and software	256,439	251,087
Machinery and Equipment, Gross	116,246	130,064
furniture, fixtures and leasehold improvements	119,613	125,276
Property, Plant and Equipment, Gross	511,550	525,157
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(228,890)	(299,900)
Property, Plant and Equipment, Net	$ 282,660	$ 225,257