Summary of Significant Accounting Policies (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
Weighted-average shares outstanding for basic and diluted net income per share
Net income	$ 10,743	$ 6,676	$ 4,750	$ 5,163	$ 5,201	$ (12,587)	$ 10,121	$ 12,945	$ 27,332	$ 15,680	$ 42,724
Basic net income per share:
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
Basic net income per common share	$ 0.18	$ 0.11	$ 0.08	$ 0.09	$ 0.09	$ (0.21)	$ 0.17	$ 0.22	$ 0.45	$ 0.26	$ 0.72
Diluted net income per share:
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
Effect of potentially dilutive securities									590	216	70
Weighted-average shares outstanding - Diluted	60,956	60,855	60,788	60,770	60,592	60,173	59,751	59,572	60,849	60,134	59,462
Diluted net income per common share	$ 0.18	$ 0.11	$ 0.08	$ 0.08	$ 0.09	$ (0.21)	$ 0.17	$ 0.22	$ 0.45	$ 0.26	$ 0.72
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
PropertyPlantandEquipmentMinimumEstimatedUsefulLife									P3Y
Diluted net income per share:
PropertyPlantandEquipmentMaximumEstimatedUsefulLife									P7Y