Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share, Basic, Other Disclosures [Abstract]

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

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

	Quarter Ended   September 30,				Nine Months Ended   September 30,
(Dollars in thousands, except per share amounts)	2015		2014		2015		2014
Net income	$	21,798	$	33,154	$	28,165	$	69,774
Basic weighted-average shares outstanding	40,846,315		40,744,667		40,831,296		40,732,704
Incremental shares due to:
Performance shares	118,149		114,579		115,534		98,877
Restricted stock units	20,624		27,816		20,039		27,416
Stock options	—		2,218		—		1,981
Diluted weighted-average shares outstanding	40,985,088		40,889,280		40,966,869		40,860,978
Basic net income per share	$	0.53	$	0.81	$	0.69	$	1.71
Diluted net income per share	$	0.53	$	0.81	$	0.69	$	1.71