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Stock plans (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options, activity during the period
Activity with respect to options for the nine months ended September 30, 2016 and 2015 was as follows:
 
Nine Months Ended September 30, 2016
 
Nine Months Ended September 30, 2015
 
Options
 
Weighted Average Grant Date Fair Value
 
Weighted Average Grant Date Exercise Price
 
Options
 
Weighted Average Grant Date Fair Value
 
Weighted Average Grant Date Exercise Price
Options outstanding, beginning of period
65,401

 
$
7.74

 
$
20.17

 
1,160,057

 
$
7.12

 
$
17.74

Options exercised
(35,351
)
 
8.16

 
17.82

 
(1,094,656
)
 
7.09

 
17.60

Options outstanding, end of period
30,050

 
$
7.24

 
$
22.93

 
65,401

 
$
7.74

 
$
20.17
Restricted shares awards, activity during the period
Activity with respect to unvested restricted share awards for the nine months ended September 30, 2016 and 2015 was as follows:
 
Nine Months Ended September 30, 2016
 
Nine Months Ended September 30, 2015
 
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
2,739,446

 
$
38.25

 
2,858,711

 
$
35.81

Restricted share awards granted
559,516

 
48.78

 
706,341

 
43.58

Restricted share awards vested
(789,547
)
 
37.36

 
(783,704
)
 
34.40

Restricted share awards forfeited
(33,070
)
 
40.25

 
(52,642
)
 
38.03

Restricted share awards outstanding, end of period
2,476,345

 
$
40.88

 
2,728,706

 
$
38.19
Restricted share units, activity during the period
Activity with respect to unvested restricted share units for the nine months ended September 30, 2016 and 2015 was as follows:
 
Nine Months Ended September 30, 2016
 
Nine Months Ended September 30, 2015
 
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
114,337

 
$
38.47

 
103,484

 
$
36.54

Restricted share units granted
21,609

 
48.83

 
28,057

 
42.91

Restricted share units vested
(23,982
)
 
38.18

 
(19,455
)
 
34.58

Restricted share units issued in lieu of cash dividends
2,436

 
39.10

 
2,337

 
37.21

Restricted share units forfeited
(8,338
)
 
44.34

 
(892
)
 
35.42

Restricted share units outstanding, end of period
106,062

 
$
40.20

 
113,531

 
$
38.47
Performance share awards, activity during the period
Activity with respect to unvested performance share awards for the nine months ended September 30, 2016 and 2015 was as follows:
 
Nine Months Ended September 30, 2016
 
Nine Months Ended September 30, 2015
 
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
172,594

 
$
40.70

 
106,369

 
$
36.03

Performance share awards granted
125,290

 
48.75

 
81,569

 
45.03

Performance share awards vested
(57,581
)
 
36.11

 
(15,344
)
 
31.38

Performance share awards conversion adjustment
45,517

 
36.82

 
—

 
—

Performance share awards outstanding, end of period
285,820

 
$
44.53

 
172,594

 
$
40.70
Total share compensation expenses
The breakdown of share compensation expenses by award type for the periods indicated was as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2016
 
2015
 
2016
 
2015
Restricted share awards
 
$
9,159

 
$
9,081

 
$
27,805

 
$
26,213

Restricted share units
 
290

 
310

 
978

 
851

Performance share awards
 
1,052

 
592

 
3,682

 
1,215

Total
 
$
10,501

 
$
9,983

 
$
32,465

 
$
28,279