Share-Based Compensation (Tables)

3 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Restricted Shares

A summary of the Company's restricted shares granted under the Plan is presented below:

Restricted Shares	Shares (in thousands)		Weighted- Average Grant-Date Fair Value
Three months ended June 30, 2014
Vested and nonvested at March 31, 2014	437.5		$	16.76
Granted	96.6		33.50
Vested and issued	(93.7	)	15.12
Forfeited	(14.4	)	20.78
Vested and nonvested at June 30, 2014	426.0		20.78
Vested at June 30, 2014	69.6		9.34
Three months ended June 30, 2015
Vested and nonvested at March 31, 2015	362.3		$	22.74
Granted	243.8		41.85
Vested and issued	(138.9	)	19.35
Forfeited	(1.4	)	33.50
Vested and nonvested at June 30, 2015	465.8		33.72
Vested at June 30, 2015	76.6		11.62

Stock Options, Valuation Assumptions

	Three Months Ended June 30,
	2015			2014
Expected volatility	40.2		%	47.3		%
Expected dividends	$	—		$	—
Expected term in years	6.0			6.0
Risk-free rate	1.7		%	2.2		%

Stock Option Activity

A summary of option activity under the Plan is as follows:

Options	Shares (in thousands)		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Three months ended June 30, 2014:
Outstanding at March 31, 2014	994.9		$	15.24
Granted	307.5		33.50
Exercised	(93.8	)	13.80
Forfeited or expired	(31.6	)	25.49
Outstanding at June 30, 2014	1,177.0		19.85		7.8	$	16,527
Exercisable at June 30, 2014	375.1		15.23		7.3	6,998
Three months ended June 30, 2015:
Outstanding at March 31, 2015	871.2		$	23.40
Granted	186.3		41.44
Exercised	(330.4	)	19.15
Forfeited or expired	(0.9	)	33.50
Outstanding at June 30, 2015	726.2		29.95		8.3	$	11,830
Exercisable at June 30, 2015	322.5		21.54		7.2	7,966