Selected Quarterly Operating Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Software, hardware and supplies	$ 16,061	$ 16,339	$ 14,230	$ 14,743	$ 15,186	$ 14,114	$ 15,562	$ 15,972	$ 61,373	$ 60,834	$ 88,572
Implementation and training services	6,684	3,658	7,040	6,266	6,518	5,046	7,809	6,575	23,648	25,948	35,008
System sales	22,745	19,997	21,270	21,009	21,704	19,160	23,371	22,547	85,021	86,782	123,580
Maintenance	43,234	43,045	42,135	40,805	41,376	39,763	40,313	38,608	169,219	160,060	156,771
Electronic data interchange services	20,082	19,051	18,906	18,319	17,421	16,637	16,545	16,692	76,358	67,295	59,709
Revenue cycle management and related services	19,720	20,392	17,432	16,693	15,316	16,178	15,467	16,015	74,237	62,976	59,219
Other services	22,607	20,939	20,776	21,068	19,386	17,116	15,385	15,667	85,390	67,554	60,950
Maintenance, EDI, RCM and other services	105,643	103,427	99,249	96,885	93,499	89,694	87,710	86,982	405,204	357,885	336,649
Total revenues	128,388	123,424	120,519	117,894	115,203	108,854	111,081	109,529	490,225	444,667	460,229
Cost of revenue:
Software, hardware and supplies	5,404	6,127	6,521	6,641	7,115	27,398	4,779	4,934	24,693	44,226	21,750
Implementation and training services	5,479	4,584	6,688	7,151	8,109	7,466	6,972	7,134	23,902	29,681	30,896
Total cost of system sales	10,883	10,711	13,209	13,792	15,224	34,864	11,751	12,068	48,595	73,907	52,646
Maintenance	7,802	7,365	6,785	6,914	6,384	5,642	5,262	5,302	28,866	22,590	20,316
Electronic data interchange services	12,274	11,956	12,015	11,999	10,845	10,276	10,650	10,796	48,244	42,567	38,350
Revenue cycle management and related services	14,252	14,246	13,202	12,706	12,059	11,736	11,007	11,401	54,406	46,203	43,324
Other services	10,630	10,082	11,562	10,779	8,842	8,537	9,012	8,505	43,053	34,896	35,016
Total cost of maintenance, EDI, RCM and other services	44,958	43,649	43,564	42,398	38,130	36,191	35,931	36,004	174,569	146,256	137,006
Total cost of revenue	55,841	54,360	56,773	56,190	53,354	71,055	47,682	48,072	223,164	220,163	189,652
Gross profit	72,547	69,064	63,746	61,704	61,849	37,799	63,399	61,457	267,061	224,504	270,577
Operating expenses:
Selling, general and administrative	41,279	41,482	38,681	36,730	38,676	36,864	38,578	35,096	158,172	149,214	148,353
Research and development costs	17,638	18,468	16,898	16,236	15,120	13,175	7,615	5,614	69,240	41,524	30,865
Amortization of acquired intangible assets	898	904	908	983	1,132	1,219	1,260	1,194	7,127	8,330	7,559
Impairment of goodwill and other assets	0	0	0	0	0	5,873	0	0	0	5,873	17,400
Total operating expenses	59,815	60,854	56,487	53,949	54,928	57,131	47,453	41,904	231,105	201,416	201,477
Income from operations	12,732	8,210	7,259	7,755	6,921	(19,332)	15,946	19,553	35,956	23,088	69,100
Interest Income (Expense), Net	(271)	(82)	69	54	322	121	(205)	31	(230)	269	(107)
Other income (expense), net	(45)	0	(26)	9	35	18	(155)	(254)	(62)	(356)	(79)
Income before provision for income taxes	12,416	8,128	7,302	7,818	7,278	(19,193)	15,586	19,330	35,664	23,001	68,914
Provision for income taxes	1,673	1,452	2,552	2,655	2,077	(6,606)	5,465	6,385	8,332	7,321	26,190
Net income	$ 10,743	$ 6,676	$ 4,750	$ 5,163	$ 5,201	$ (12,587)	$ 10,121	$ 12,945	$ 27,332	$ 15,680	$ 42,724
Net income per share:
Basic	$ 0.18	$ 0.11	$ 0.08	$ 0.09	$ 0.09	$ (0.21)	$ 0.17	$ 0.22	$ 0.45	$ 0.26	$ 0.72
Diluted	$ 0.18	$ 0.11	$ 0.08	$ 0.08	$ 0.09	$ (0.21)	$ 0.17	$ 0.22	$ 0.45	$ 0.26	$ 0.72
Weighted-average shares outstanding:
Basic	60,288	60,272	60,247	60,230	60,208	60,173	59,734	59,559	60,259	59,918	59,392
Diluted	60,956	60,855	60,788	60,770	60,592	60,173	59,751	59,572	60,849	60,134	59,462
Dividends declared per common share	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0.7	$ 0.7	$ 0.7