Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share Basic Other Disclosures [Abstract]

Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted EPS

The following table reconciles the number of shares used in calculating basic and diluted earnings per share:

	Three Months Ended June 30,					Six Months Ended June 30,
(Dollars in thousands, except per share amounts)	2017		2016			2017		2016
Net income (loss)	$	24,244	$	(31,238	)	$	41,165	$	(31,081	)
Basic weighted-average shares outstanding		40,822,726		40,784,129			40,802,057		40,836,503
Incremental shares due to:
Performance shares		355,844		—			305,625		—
Restricted stock units		40,399		—			36,013		—
Diluted weighted-average shares outstanding		41,218,969		40,784,129			41,143,695		40,836,503
Basic net income (loss) per share	$	0.59	$	(0.77	)	$	1.01	$	(0.76	)
Diluted net income (loss) per share	$	0.59	$	(0.77	)	$	1.00	$	(0.76	)