Earnings per Share (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
(Dollars in thousands, except per share amounts)	2018		2017		2018		2017
Net income	$	60,336	$	33,700	$	121,081	$	74,865
Basic weighted-average shares outstanding		62,985,517		40,829,399		58,765,381		40,814,135
Incremental shares due to:
Performance shares		269,998		378,149		262,648		331,082
Restricted stock units		37,535		42,909		32,736		37,578
Stock portion of earnings and profits distribution		1,428,607		—		481,435		—
Diluted weighted-average shares outstanding		64,721,657		41,250,457		59,542,200		41,182,795
Basic net income per share	$	0.96	$	0.83	$	2.06	$	1.83
Diluted net income per share	$	0.93	$	0.82	$	2.03	$	1.82