Stockholders' Equity (Tables)

12 Months Ended

Mar. 31, 2016

Stockholders' Equity Note [Abstract]

Summary of stock compensation amounts recognized in the consolidated statements of comprehensive income

The table below summarizes stock compensation amounts recognized in the consolidated statements of comprehensive income (loss):

	Years ended March 31,						Quarter ended (transition period) March 31,			Year ended December 31,
	2016			2015			2014			2013
Compensation expense recorded for:
NSUs	$	6,163		$	9,295		$	1,863		$	10,545
SARs	893			1,846			381			1,302
RSUs	(1,511		)	1,323			354			287
Directors' shares	1,077			1,060			267			1,002
Total compensation expense	6,622			13,524			2,865			13,136
Income tax benefit recognized	(2,525		)	(5,143		)	(1,082		)	(4,950		)
Net compensation expense	$	4,097		$	8,381		$	1,783		$	8,186

Summary of the total remaining unrecognized compensation cost related to nonvested awards, that are considered probable of vesting and the weighted-average period over which the cost is expected to be recognized

The table below summarizes the total remaining unrecognized compensation cost related to nonvested awards that the Company considers are probable to vest and the weighted-average period over which the cost is expected to be recognized at March 31, 2016:

	Unrecognized Compensation Cost		Weighted-Average Remaining Vesting Period (Years)
NSUs	$	6,568	1.2
SARs	117		0.8
RSUs	17		0.8
Total	$	6,702

Summary of Nonvested Stock Units

The table below summarizes the 2006 Plan and the 2015 SIP activity:

	Number of Shares		Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2013	371,000		$	58.51
Granted	304,000		57.30
Vested	(315,000	)	53.19
Forfeited	(20,000	)	61.08
Nonvested at December 31, 2013	340,000		62.23
Granted	—		—
Vested	(2,000	)	58.11
Forfeited	(7,000	)	64.15
Nonvested at March 31, 2014	331,000		62.21
Granted	196,000		82.34
Vested	(142,000	)	68.39
Forfeited	(30,000	)	64.18
Cancelled*	(15,000	)	84.04
Nonvested at March 31, 2015	340,000		70.11
Granted	240,000		70.82
Vested	(132,000	)	66.74
Forfeited	(91,000	)	72.84
Cancelled*	(154,000	)	74.22
Nonvested at March 31, 2016	203,000		68.80

*Nonvested Stock Units cancelled during the period represent awards granted with respect to which performance criteria were not met.

Summary of Stock Appreciation Rights Issued Under the 2006 Plan

The table below summarizes stock appreciation rights activity under the 2006 Plan:

	Number of SARs		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2013	745,000		$	26.73	7.9	$	10,100
Granted	—		—
Exercised	(15,000	)	26.73
Forfeited	—		—
Outstanding at December 31, 2013	730,000		26.73		6.9	42,100
Granted	—		—
Exercised	—		—
Forfeited	—		—
Outstanding at March 31, 2014	730,000		26.73		6.7	38,700
Granted	—		—
Exercised	(15,000	)	26.73
Forfeited	—		—
Outstanding at March 31, 2015	715,000		26.73		5.8	33,000
Granted	—		—
Exercised	(80,000	)	26.73
Forfeited	(15,000	)	26.73
Outstanding at March 31, 2016	620,000		26.73		3.5	20,600
Exercisable at March 31, 2016	530,000		26.73		3.3	17,600
Expected to vest and exercisable at March 31, 2016	620,000		26.73		3.5	20,600

Summary of Restricted Stock Units Issued

The table below summarizes the restricted stock unit activity under the 2006 Plan and 2015 SIP:

	Number of Shares		Weighted- Average Grant-Date Fair Value
Nonvested at January 1, 2013	671,000		$	62.80
Granted	156,000		84.52
Vested	—		—
Forfeited	(32,000	)	63.69
Nonvested at December 31, 2013	795,000		67.03
Granted	—		—
Vested	—		—
Forfeited	(66,000	)	67.23
Nonvested at March 31, 2014	729,000		67.01
Granted	160,000		98.29
Vested	—		—
Forfeited	(35,000	)	78.39
Cancelled*	(230,000	)	82.09
Nonvested at March 31, 2015	624,000		68.82
Granted	308,000		50.05
Vested	(47,000	)	26.73
Forfeited	(232,000	)	70.98
Cancelled*	(264,000	)	63.22
Nonvested at March 31, 2016	389,000		61.53

*Nonvested Stock Units cancelled during the period represent awards granted with respect to which performance criteria were not met.