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Stock-Based Compensation Plans (Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 21,049 $ 17,446 $ 14,921
Tax benefit (8,083) (6,699) (5,759)
Stock-based compensation expense, net of tax 12,966 10,747 9,162
Cost of equipment sales      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 998 1,004 886
Cost of software      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 211 95 0
Cost of support services      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 786 607 382
Cost of business services      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 845 694 527
Selling, general and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 16,460 14,028 11,099
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 1,749 1,018 435
Discontinued operations | Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense [1] $ 0 $ 0 $ 1,592
[1] Amount represents the expense related to the immediate vesting of restricted stock units and stock options held by employees of PBMS upon the sale of the business.