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Segment Information - Financial Performance of Reporting Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenues $ 112,788 $ 105,052 $ 229,009 $ 206,816
Cost of revenues 55,326 49,012 109,862 96,281
Gross profit 57,462 56,040 119,147 110,535
Operating expenses 45,038 43,482 96,344 88,023
Income from operations 12,424 12,558 22,803 22,512
Operating segments [Member]        
Segment Reporting Information [Line Items]        
Revenues 112,788 105,052 229,009 206,816
Cost of revenues 55,326 49,012 109,862 96,281
Gross profit 57,462 56,040 119,147 110,535
Operating expenses 31,888 30,844 66,818 60,597
Income from operations 25,574 25,196 52,329 49,938
Operating segments [Member] | Automation and Analytics [Member]        
Segment Reporting Information [Line Items]        
Revenues 88,701 84,702 181,480 166,201
Cost of revenues 39,403 35,992 78,255 70,932
Gross profit 49,298 48,710 103,225 95,269
Operating expenses 25,978 26,044 54,567 51,146
Income from operations 23,320 22,666 48,658 44,123
Operating segments [Member] | Medication Adherence [Member]        
Segment Reporting Information [Line Items]        
Revenues 24,087 20,350 47,529 40,615
Cost of revenues 15,923 13,020 31,607 25,349
Gross profit 8,164 7,330 15,922 15,266
Operating expenses 5,910 4,800 12,251 9,451
Income from operations 2,254 2,530 3,671 5,815
Corporate cost [Member]        
Segment Reporting Information [Line Items]        
Operating expenses $ 13,150 $ 12,638 $ 29,526 $ 27,426