Share-based Compensation (Details 1) (2006 Stock Incentive Plan [Member], Stock Options [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012
2006 Stock Incentive Plan [Member] | Stock Options [Member]
Stock options granted by the Company
Outstanding at April 1, 2012, Number of Options	971,001
Outstanding at April 1, 2012, Weighted Average Exercise Price	$ 13.52
Exercised, Number of Options	(26,667)
Exercised, Weighted-Average Exercise Price	$ 2.51
Cancelled/expired, Number of options	(23,334)
Cancelled/Expired, Weighted-Average Exercise Price	$ 15.99
Outstanding and exercisable at June 30, 2012, Number of Options	921,000
Outstanding and exercisable at June 30, 2012, Weighted Average Exercise Price	$ 13.78
Remaining Contractual Term, Outstanding and exercisable at June 30, 2012	3 years 8 months 5 days
Aggregate Intrinsic Value, Outstanding and exercisable at June 30, 2012	$ 498