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Stock plans (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options, activity during the period
Activity with respect to options for the three months ended March 31, 2017 was as follows:
 
Options
 
Weighted Average Grant Date Fair Value
 
Weighted Average Grant Date Exercise Price
Options outstanding, beginning and end of period
26,136

 
$
6.78

 
$
23.48
Restricted shares awards, activity during the period
Activity with respect to unvested restricted share awards for the three months ended March 31, 2018 and 2017 was as follows:
 
Three Months Ended March 31,
 
2018
 
2017
 
Restricted Share Awards
 
Weighted Average Grant Date Fair Value
 
Restricted Share Awards
 
Weighted Average Grant Date Fair Value
Restricted share awards outstanding, beginning of period
2,080,397

 
$
43.66

 
2,469,982

 
$
40.89

Restricted share awards granted
1,552

 
67.64

 
2,082

 
57.66

Restricted share awards vested
(8,092
)
 
44.49

 
(4,571
)
 
37.93

Restricted share awards forfeited
(6,138
)
 
47.46

 
(513
)
 
48.69

Restricted share awards outstanding, end of period
2,067,719

 
$
43.66

 
2,466,980

 
$
40.91
Restricted share units, activity during the period
Activity with respect to unvested restricted share units for the three months ended March 31, 2018 and 2017 was as follows:
 
Three Months Ended March 31,
 
2018
 
2017
 
Restricted Share Units
 
Weighted Average Grant Date Fair Value
 
Restricted Share Units
 
Weighted Average Grant Date Fair Value
Restricted share units outstanding, beginning of period
109,394

 
$
42.20

 
112,808

 
$
40.95

Restricted share units vested
(2,178
)
 
38.24

 
(2,115
)
 
38.24

Restricted share units issued in lieu of cash dividends
886

 
42.20

 
717

 
40.95

Restricted share units forfeited
(1
)
 
38.24

 
—

 
—

Restricted share units outstanding, end of period
108,101

 
$
42.28

 
111,410

 
$
41.01
Performance share awards, activity during the period
Activity with respect to unvested performance share awards for the three months ended March 31, 2018 and 2017 was as follows:
 
Three Months Ended March 31,
 
2018
 
2017
 
Performance Share Awards
 
Weighted Average Grant Date Fair Value
 
Performance Share Awards
 
Weighted Average Grant Date Fair Value
Performance share awards outstanding, beginning of period
314,068

 
$
49.37

 
285,820

 
$
44.53

Performance share awards conversion adjustment
—

 
—

 
(26,322
)
 
36.82

Performance share awards outstanding, end of period
314,068

 
$
49.37

 
259,498

 
$
45.26
Total share compensation expenses
The breakdown of share compensation expenses by award type is as follows:
 
Three Months Ended March 31,
 
2018
 
2017
Restricted share awards
$
8,113

 
$
9,044

Restricted share units
332

 
315

Performance share awards
1,284

 
132

Total
$
9,729

 
$
9,491