Common Stock (Tables)

3 Months Ended

Mar. 31, 2014

Class of Stock Disclosures [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

Basic and Diluted Earnings Per Share. The basic and diluted earnings per share are presented below (in thousands except for share data):
	Three Months Ended March 31,						Twelve Months Ended March 31,
	2014			2013			2014			2013
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	40,149,083			40,078,061			40,132,106			40,015,380
Dilutive effect of unvested performance awards	—			—			12,053			50,206
Dilutive effect of stock options	—			—			—			9,234
Diluted number of common shares outstanding	40,149,083			40,078,061			40,144,159			40,074,820
Basic net income per common share:
Net income	$	4,615		$	7,634		$	85,564		$	95,136
Income allocated to participating restricted stock	(36		)	(26		)	(260		)	(248		)
Net income available to common shareholders	$	4,579		$	7,608		$	85,304		$	94,888
Diluted net income per common share:
Net income	$	4,615		$	7,634		$	85,564		$	95,136
Income reallocated to participating restricted stock	(36		)	(26		)	(260		)	(247		)
Net income available to common shareholders	$	4,579		$	7,608		$	85,304		$	94,889
Basic net income per common share:
Distributed earnings	$	0.265		$	0.25		$	1.06		$	1.00
Undistributed earnings	(0.155		)	(0.06		)	1.07			1.37
Basic net income per common share	$	0.110		$	0.19		$	2.13		$	2.37
Diluted net income per common share:
Distributed earnings	$	0.265		$	0.25		$	1.06		$	1.00
Undistributed earnings	(0.155		)	(0.06		)	1.06			1.37
Diluted net income per common share	$	0.110		$	0.19		$	2.12		$	2.37

Schedule of Antidilutive Securities Excluded From Computation Of Earnings Per Share

The amount of restricted stock awards and performance shares at 100% performance level excluded from the calculation of the diluted number of common shares outstanding because their effect was antidilutive is presented below:
	Three Months Ended		Twelve Months Ended
	March 31,		March 31,
	2014	2013	2014	2013
Restricted stock awards	79,413	56,101	57,017	44,253
Performance shares (a)	128,508	124,997	90,384	78,112

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(a) Certain performance shares were excluded from the computation of diluted earnings per share as no payouts would have been required based upon performance at the end of each corresponding period.