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Composition of Certain Financial Statement Captions (Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross $ 357,584   $ 357,584   $ 339,059
Less: Accumulated depreciation (230,899)   (230,899)   (220,064)
Property and Equipment, net 126,685   126,685   118,995
Depreciation expense 5,331 5,730 10,915 11,434  
Building [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 138,508   138,508   138,426
Equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 74,120   74,120   70,117
Land [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 9,997   9,997   9,929
Purchased Software [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 101,936   101,936   96,268
Furniture and Fixtures [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 17,073   17,073   17,060
Leasehold Improvements [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 5,608   5,608   4,670
Construction in Progress [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross $ 10,342   $ 10,342   $ 2,589