Selected Quarterly Operating Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Software, hardware and supplies	$ 15,186	$ 14,114	$ 15,562	$ 15,972	$ 17,109	$ 21,899	$ 23,720	$ 25,844	$ 60,834	$ 88,572	$ 122,407
Implementation and training services	6,518	5,046	7,809	6,575	7,161	7,266	8,535	12,046	25,948	35,008	26,391
System sales	21,704	19,160	23,371	22,547	24,270	29,165	32,255	37,890	86,782	123,580	148,798
Maintenance	41,376	39,763	40,313	38,608	40,025	39,463	38,715	38,568	160,060	156,771	138,832
Electronic data interchange services	17,421	16,637	16,545	16,692	15,653	15,209	15,024	13,823	67,295	59,709	49,259
Revenue cycle management and related services	15,316	16,178	15,467	16,015	15,317	15,015	14,486	14,401	62,976	59,219	45,572
Other services	19,386	17,116	15,385	15,667	16,030	15,658	15,648	13,614	67,554	60,950	47,374
Maintenance, EDI, RCM and other services	93,499	89,694	87,710	86,982	87,025	85,345	83,873	80,406	357,885	336,649	281,037
Total revenues	115,203	108,854	111,081	109,529	111,295	114,510	116,128	118,296	444,667	460,229	429,835
Cost of revenue:
Software, hardware and supplies	7,115	27,398	4,779	4,934	5,695	4,660	5,624	5,771	44,226	21,750	18,399
Implementation and training services	8,109	7,466	6,972	7,134	7,023	7,221	7,507	9,145	29,681	30,896	21,298
Total cost of system sales	15,224	34,864	11,751	12,068	12,718	11,881	13,131	14,916	73,907	52,646	39,697
Maintenance	6,384	5,642	5,262	5,302	5,505	5,259	4,741	4,811	22,590	20,316	17,104
Electronic data interchange services	10,845	10,276	10,650	10,796	10,099	9,852	9,151	9,248	42,567	38,350	32,422
Revenue cycle management and related services	12,059	11,736	11,007	11,401	10,980	10,918	10,556	10,870	46,203	43,324	34,295
Other services	8,842	8,537	9,012	8,505	8,995	8,686	8,785	8,550	34,896	35,016	27,705
Total cost of maintenance, EDI, RCM and other services	38,130	36,191	35,931	36,004	35,579	34,715	33,233	33,479	146,256	137,006	111,526
Total cost of revenue	53,354	71,055	47,682	48,072	48,297	46,596	46,364	48,395	220,163	189,652	151,223
Gross profit	61,849	37,799	63,399	61,457	62,998	67,914	69,764	69,901	224,504	270,577	278,612
Operating expenses:
Selling, general and administrative	38,676	36,864	38,578	35,096	38,308	35,532	37,832	36,681	149,214	148,353	128,846
Research and development costs	15,120	13,175	7,615	5,614	8,231	7,786	6,272	8,576	41,524	30,865	31,369
Amortization of acquired intangible assets	1,132	1,219	1,260	1,194	1,194	1,212	1,316	1,137	8,330	7,559	4,501
Impairment of goodwill and other assets	0	5,873	0	0	17,400	0	0	0	5,873	17,400	0
Total operating expenses	54,928	57,131	47,453	41,904	65,133	44,530	45,420	46,394	201,416	201,477	162,413
Income from operations	6,921	(19,332)	15,946	19,553	(2,135)	23,384	24,344	23,507	23,088	69,100	116,199
Interest income	322	121	(205)	31	(93)	13	(62)	35	269	(107)	247
Other income (expense), net	35	18	(155)	(254)	36	(122)	220	(213)	(356)	(79)	(139)
Income before provision for income taxes	7,278	(19,193)	15,586	19,330	(2,192)	23,275	24,502	23,329	23,001	68,914	116,307
Provision for income taxes	2,077	(6,606)	5,465	6,385	1,898	7,649	8,811	7,832	7,321	26,190	40,650
Net income	$ 5,201	$ (12,587)	$ 10,121	$ 12,945	$ (4,090)	$ 15,626	$ 15,691	$ 15,497	$ 15,680	$ 42,724	$ 75,657
Net income per share:
Basic	$ 0.09	$ (0.21)	$ 0.17	$ 0.22	$ (0.07)	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.72	$ 1.29
Diluted	$ 0.09	$ (0.21)	$ 0.17	$ 0.22	$ (0.07)	$ 0.26	$ 0.26	$ 0.26	$ 0.26	$ 0.72	$ 1.28
Weighted-average shares outstanding:
Basic	60,208	60,173	59,734	59,559	59,541	59,400	59,347	59,281	59,918	59,392	58,729
Diluted	60,592	60,173	59,751	59,572	59,541	59,405	59,386	59,388	60,134	59,462	59,049
Dividends declared per common share	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0.7	$ 0.7	$ 0.7