Share-based Compensation (Details 2) (Stock Settled Stock Appreciation Rights (SSARS) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Sep. 30, 2012
Stock Settled Stock Appreciation Rights (SSARS) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Rights Outstanding at April 1, 2012	606,834
Weighted Average Exercise Price Outstanding at April 1, 2012	$ 6.91
Number of Rights Granted,	318,607
Weighted Average Exercise Price Granted,	$ 7.52
Number of Rights Exercised	(138,207)
Weighted Average Exercise Price Exercised	$ 6.56
Number of Rights, Forfeited	(31,877)
Weighted Average Exercise Price, Forfeited	$ 7.42
Number of Rights Outstanding at September 30, 2012	755,357
Weighted Average Exercise Price Outstanding at September 30, 2012	$ 7.21
Remaining Contractual Term Outstanding at September 30, 2012	7 years 9 months 4 days
Aggregate Intrinsic Value Outstanding at September 30, 2012	$ 1,053
Number of Rights Exercisable at September 2012	305,499
Weighted Average Exercise Price Exercisable at September 30, 2012	$ 6.68
Remaining Contractual Term Exercisable at September 30, 2012	5 years 2 months 23 days
Aggregate Intrinsic Value Exercisable at September 30, 2012	$ 587