Common Stock (Tables)

3 Months Ended

Mar. 31, 2018

Common Stock, Number of Shares, Par Value and Other 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,
	2018			2017			2018			2017
Weighted average number of common shares outstanding:
Basic number of common shares outstanding	40,491,194			40,387,235			40,440,189			40,366,024
Dilutive effect of unvested performance awards	—			—			123,436			69,665
Diluted number of common shares outstanding	40,491,194			40,387,235			40,563,625			40,435,689
Basic net income (loss) per common share:
Net income (loss)	$	(6,966	)	$	(3,989	)	$	95,285		$	98,587
Income allocated to participating restricted stock	(48		)	(45		)	(353		)	(349		)
Net income (loss) available to common shareholders	$	(7,014	)	$	(4,034	)	$	94,932		$	98,238
Diluted net income (loss) per common share:
Net income (loss)	$	(6,966	)	$	(3,989	)	$	95,285		$	98,587
Income reallocated to participating restricted stock	(48		)	(45		)	(353		)	(349		)
Net income (loss) available to common shareholders	$	(7,014	)	$	(4,034	)	$	94,932		$	98,238
Basic net income (loss) per common share:
Distributed earnings	$	0.335		$	0.31		$	1.34		$	1.24
Undistributed earnings (losses)	(0.505		)	(0.41		)	1.01			1.19
Basic net income (loss) per common share	$	(0.170	)	$	(0.10	)	$	2.35		$	2.43
Diluted net income (loss) per common share:
Distributed earnings	$	0.335		$	0.31		$	1.34		$	1.24
Undistributed earnings (losses)	(0.505		)	(0.41		)	1.00			1.19
Diluted net income (loss) per common share	$	(0.170	)	$	(0.10	)	$	2.34		$	2.43

Schedule of Antidilutive Securities Excluded From Computation Of Earnings Per Share

The number 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,
	2018	2017	2018	2017
Restricted stock awards	72,218	78,025	66,288	58,344
Performance shares (a)	45,977	—	11,494	47,246

________________________

(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.