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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Earnings per share
The following table reflects the calculation of basic and diluted earnings per share. During each period, certain stock options, as noted below, were excluded from the calculation of diluted earnings per share because their effect would have been antidilutive. 
 
 
Quarter Ended
June 30,
 
Six Months Ended
June 30,
(dollars and shares in thousands, except per share amounts)
 
2016
 
2015
 
2016
 
2015
Earnings per share – basic:
 
 
 
 
 
 
 
 
Net income
 
$
58,389

 
$
56,063

 
$
116,491

 
$
102,003

Income allocated to participating securities
 
(493
)
 
(376
)
 
(954
)
 
(669
)
Income available to common shareholders
 
$
57,896

 
$
55,687


$
115,537

 
$
101,334

Weighted-average shares outstanding
 
48,611

 
49,770

 
48,699

 
49,732

Earnings per share – basic
 
$
1.19

 
$
1.12

 
$
2.37

 
$
2.04

 
 
 
 
 
 
 
 
 
Earnings per share – diluted:
 
 

 
 

 
 
 
 
Net income
 
$
58,389

 
$
56,063

 
$
116,491

 
$
102,003

Income allocated to participating securities
 
(489
)
 
(374
)
 
(948
)
 
(665
)
Re-measurement of share-based awards classified as liabilities
 
88

 
(132
)
 
293

 
47

Income available to common shareholders
 
$
57,988

 
$
55,557


$
115,836

 
$
101,385

Weighted-average shares outstanding
 
48,611

 
49,770

 
48,699

 
49,732

Dilutive impact of potential common shares
 
429

 
400

 
412

 
404

Weighted-average shares and potential common shares outstanding
 
49,040

 
50,170


49,111

 
50,136

Earnings per share – diluted
 
$
1.18

 
$
1.11

 
$
2.36

 
$
2.02

Antidilutive options excluded from calculation
 
236

 
260

 
236

 
260