Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Components of Calculation of Earnings Per Share

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

	2015		2014		2013
	(Dollars and shares in thousands)
Net income	$	172,413	$	182,391	$	185,413
Weighted average number of shares used in:
Basic earnings per share	61,021		63,426		64,254
Dilutive common stock equivalents:
Restricted stock units	285		319		404
Diluted earnings per share	61,306		63,745		64,658