Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Components of Calculation of Earnings Per Share

The components of the calculation of earnings per share were as follows:

	2017		2016		2015
	(Dollars and shares in thousands)
Net income	$	269,659	$	153,351	$	172,413
Weighted average number of shares used in:
Basic earnings per share	110,353		119,732		122,042
Dilutive common stock equivalents:
Restricted stock units	1,010		766		570
Diluted earnings per share	111,363		120,498		122,612