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Earnings per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings per share - basic:        
Net income $ 59,579 $ 58,389 $ 116,645 $ 116,491
Income allocated to participating securities (379) (493) (785) (954)
Income available to common shareholders $ 59,200 $ 57,896 $ 115,860 $ 115,537
Weighted-average shares outstanding 48,255 48,611 48,287 48,699
Earnings per share - basic $ 1.23 $ 1.19 $ 2.40 $ 2.37
Earnings per share - diluted:        
Net income $ 59,579 $ 58,389 $ 116,645 $ 116,491
Income allocated to participating securities (378) (489) (781) (948)
Re-measurement of share-based awards classified as liabilities (41) 88 (46) 293
Income available to common shareholders $ 59,160 $ 57,988 $ 115,818 $ 115,836
Weighted-average shares outstanding 48,255 48,611 48,287 48,699
Dilutive impact of potential common shares 325 429 349 412
Weighted-average shares and potential common shares outstanding 48,580 49,040 48,636 49,111
Earnings per share - diluted $ 1.22 $ 1.18 $ 2.38 $ 2.36
Antidilutive options excluded from calculation 451 236 451 236