Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Reconciliation of Number of Shares Used in Calculating Basic and Diluted Earnings per Share

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)	2018		2017		2018		2017
Net income	$	46,148	$	24,244	$	60,745	$	41,165
Basic weighted-average shares outstanding		62,979,660		40,822,726		56,739,012		40,802,057
Incremental shares due to:
Performance shares		302,815		355,844		298,883		305,625
Restricted stock units		33,816		40,399		90,125		36,013
Diluted weighted-average shares outstanding		63,316,291		41,218,969		57,128,020		41,143,695
Basic net income per share	$	0.73	$	0.59	$	1.07	$	1.01
Diluted net income per share	$	0.73	$	0.59	$	1.06	$	1.00