Share-based Compensation (Details 2) (Stock Incentive Loan [Member], Stock Settled Stock Appreciation Rights (SSARS) [Member], USD $)	3 Months Ended
	Jun. 30, 2012
Stock Incentive Loan [Member] | 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	(80,651)
Weighted Average Exercise Price Exercised	$ 6.53
Number of Rights, Forfeited	(24,708)
Weighted Average Exercise Price, Forfeited	$ 7.42
Number of Rights Outstanding at June 30, 2012	820,082
Weighted Average Exercise Price Outstanding at June 30, 2012	$ 7.17
Aggregate Intrinsic Value Outstanding at June 30, 2012	$ 1,234
Remaining Contractual Term Outstanding at June 30, 2012	7 years 8 months 19 days
Number of Rights Exercisable at June 2012	363,055
Weighted Average Exercise Price Exercisable at June 30, 2012	$ 6.67
Remaining Contractual Term Exercisable at June 30, 2012	5 years 2 months 9 days
Aggregate Intrinsic Value Exercisable at June 30, 2012	$ 727