Common Stock (Tables)

6 Months Ended

Jun. 30, 2013

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 June 30,
	2013			2012
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	40,111,757			39,958,149
Dilutive effect of unvested performance awards	48,213			64,698
Dilutive effect of stock options	—			17,929
Diluted number of common shares outstanding	40,159,970			40,040,776
Basic net income per common share:
Net income	$	29,193		$	30,894
Income allocated to participating restricted stock	(85		)	(83		)
Net income available to common shareholders	$	29,108		$	30,811
Diluted net income per common share:
Net income	$	29,193		$	30,894
Income reallocated to participating restricted stock	(84		)	(83		)
Net income available to common shareholders	$	29,109		$	30,811
Basic net income per common share:
Distributed earnings	$	0.265		$	0.25
Undistributed earnings	0.465			0.52
Basic net income per common share	$	0.730		$	0.77
Diluted net income per common share:
Distributed earnings	$	0.265		$	0.25
Undistributed earnings	0.455			0.52
Diluted net income per common share	$	0.720		$	0.77

	Six Months Ended June 30,
	2013			2012
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	40,095,002			39,934,590
Dilutive effect of unvested performance awards	24,107			65,450
Dilutive effect of stock options	—			20,103
Diluted number of common shares outstanding	40,119,109			40,020,143
Basic net income per common share:
Net income	$	36,827		$	34,238
Income allocated to participating restricted stock	(102		)	(104		)
Net income available to common shareholders	$	36,725		$	34,134
Diluted net income per common share:
Net income	$	36,827		$	34,238
Income reallocated to participating restricted stock	(102		)	(104		)
Net income available to common shareholders	$	36,725		$	34,134
Basic net income per common share:
Distributed earnings	$	0.515		$	0.47
Undistributed earnings	0.405			0.38
Basic net income per common share	$	0.920		$	0.85
Diluted net income per common share:
Distributed earnings	$	0.515		$	0.47
Undistributed earnings	0.405			0.38
Diluted net income per common share	$	0.920		$	0.85

	Twelve Months Ended June 30,
	2013			2012
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	40,053,677			40,285,248
Dilutive effect of unvested performance awards	46,084			148,256
Dilutive effect of stock options	4,752			22,122
Diluted number of common shares outstanding	40,104,513			40,455,626
Basic net income per common share:
Net income	$	93,435		$	98,012
Income allocated to participating restricted stock	(248		)	(379		)
Net income available to common shareholders	$	93,187		$	97,633
Diluted net income per common share:
Net income	$	93,435		$	98,012
Income reallocated to participating restricted stock	(248		)	(378		)
Net income available to common shareholders	$	93,187		$	97,634
Basic net income per common share:
Distributed earnings	$	1.015		$	0.91
Undistributed earnings	1.315			1.51
Basic net income per common share	$	2.330		$	2.42
Diluted net income per common share:
Distributed earnings	$	1.015		$	0.91
Undistributed earnings	1.305			1.50
Diluted net income per common share	$	2.320		$	2.41

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		Six Months Ended		Twelve Months Ended
	June 30,		June 30,		June 30,
	2013	2012	2013	2012	2013	2012
Restricted stock awards	38,040	32,101	47,071	45,951	45,738	63,699
Performance shares (a)	85,183	51,133	105,090	47,092	86,624	23,546

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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 the corresponding periods.