Share Based Awards (Details 3) (USD $)	3 Months Ended
	Jun. 30, 2011
Schedule of Employee Stock Options and Performance Based Awards by Nonvested Stock Options
Non-Vested Number of Shares Outstanding Beginning Balance	401,518
Weighted Average Fair Value Price Outstanding Beginning Balance	$ 16.17
Non-Vested Number of Shares Granted	229,700
Weighted Average Fair Value Price Granted	$ 26.64
Non-Vested Number of Shares Vested	(63,565)
Weighted Average Fair Value Price Vested	$ 12.01
Non-Vested Number Of Shares Forfeited	0
Weighted Average Fair Value Price Forfeited	$ 0
Non-Vested Number of Share Outstanding Ending Balance	567,653
Weighted Average Fair Value Price Outstanding Ending Balance	$ 20.87