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Composition of Certain Financial Statement Captions (Property And Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross $ 364,381   $ 364,381   $ 339,059
Less: Accumulated depreciation (235,606)   (235,606)   (220,064)
Property and Equipment, net 128,775   128,775   118,995
Depreciation expense 5,579 5,616 16,494 17,050  
Building [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 149,056   149,056   138,426
Equipment [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 77,078   77,078   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 104,304   104,304   96,268
Furniture and Fixtures [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 17,095   17,095   17,060
Leasehold Improvements [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross 5,536   5,536   4,670
Construction in Progress [Member]
         
Property, Plant and Equipment [Line Items]          
Property and Equipment, gross $ 1,315   $ 1,315   $ 2,589