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Stock plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options, activity during the period
Activity with respect to options for the year ended December 31, 2016 was as follows:
 
Options
 
Weighted Average Grant Date Fair Value
 
Weighted Average Grant Date Exercise Price
 
Total
Intrinsic Value (a)
 
Company Proceeds Received
Options outstanding, beginning of year
65,401

 
$
7.74

 
$
20.17

 
 
 
 
Options exercised
(39,265
)
 
8.37

 
17.96

 
$
1,260

 
$
277

Options outstanding, end of year
26,136

 
$
6.78

 
$
23.48

 
 
 
 

Activity with respect to options for the year ended December 31, 2015 was as follows:
 
Options
 
Weighted Average Grant Date Fair Value
 
Weighted Average Grant Date Exercise Price
 
Total
Intrinsic Value (a)
 
Company Proceeds Received
Options outstanding, beginning of year
1,160,057

 
$
7.12

 
$
17.74

 
 
 
 
Options exercised
(1,094,656
)
 
7.09

 
17.60

 
$
26,367

 
$
6,277

Options outstanding, end of year
65,401

 
$
7.74

 
$
20.17

 
 
 
 
Activity with respect to options for the year ended December 31, 2014 was as follows:
 
Options
 
Weighted Average Grant Date Fair Value
 
Weighted Average Grant Date Exercise Price
 
Total
Intrinsic Value (a)
 
Company Proceeds Received
Options outstanding, beginning of year
1,572,713

 
$
6.66

 
$
18.88

 
 
 
 
Options exercised
(412,656
)
 
5.36

 
22.07

 
$
7,459

 
$
9,107

Options outstanding, end of year
1,160,057

 
$
7.12

 
$
17.74

 
 
 
 
(a)
The total intrinsic value in the tables above represent the amount by which the market price of the Company’s common stock is greater than the option strike price multiplied by the number of options exercised during the year.
Restricted share awards, activity during the period
Activity with respect to unvested restricted share awards for the years ended December 31, 2016, 2015 and 2014 was as follows:
 
Years Ended December 31,
 
2016
 
2015
 
2014
 
Restricted Share Awards
 
Weighted Average Grant Date Fair Value
 
Restricted Share Awards
 
Weighted Average Grant Date Fair Value
 
Restricted Share Awards
 
Weighted Average Grant Date Fair Value
Restricted share awards outstanding, beginning of year
2,739,446

 
$
38.25

 
2,858,711

 
$
35.81

 
2,684,745

 
$
33.74

Restricted share awards granted
564,345

 
48.83

 
724,357

 
43.67

 
1,051,348

 
37.81

Restricted share awards vested
(796,716
)
 
37.40

 
(788,758
)
 
34.41

 
(797,446
)
 
31.44

Restricted share awards forfeited
(37,093
)
 
41.27

 
(54,864
)
 
38.14

 
(79,936
)
 
36.09

Restricted share awards outstanding, end of year
2,469,982

 
$
40.89

 
2,739,446

 
$
38.25

 
2,858,711

 
$
35.81
Restricted share unit awards, activity during the period
Activity with respect to unvested restricted share units for the years ended December 31, 2016, 2015 and 2014 was as follows:
 
Years Ended December 31,
 
2016
 
2015
 
2014
 
Restricted Share Units
 
Weighted Average Grant Date Fair Value
 
Restricted Share Units
 
Weighted Average Grant Date Fair Value
 
Restricted Share Units
 
Weighted Average Grant Date Fair Value
Restricted share units outstanding, beginning of year
114,337

 
$
38.47

 
103,484

 
$
36.54

 
66,518

 
$
33.74

Restricted share units granted
27,609

 
50.03

 
28,057

 
42.91

 
53,025

 
38.10

Restricted share units vested
(23,982
)
 
38.18

 
(19,455
)
 
34.58

 
(18,325
)
 
30.71

Restricted share units issued in lieu of cash dividends
3,182

 
39.36

 
3,143

 
37.53

 
2,266

 
35.00

Restricted share units forfeited
(8,338
)
 
44.34

 
(892
)
 
35.42

 
—

 
—

Restricted share units outstanding, end of year
112,808

 
$
40.95

 
114,337

 
$
38.47

 
103,484

 
$
36.54
Performance share awards, activity during the period
Activity with respect to unvested performance share awards for the years ended December 31, 2016, 2015, and 2014 was as follows:
 
Years Ended December 31,
 
2016
 
2015
 
2014
 
Performance Share Awards
 
Weighted Average Grant Date Fair Value
 
Performance Share Awards
 
Weighted Average Grant Date Fair Value
 
Performance Share Awards
 
Weighted Average Grant Date Fair Value
Performance share awards outstanding, beginning of year
172,594

 
$
40.70

 
106,369

 
$
36.03

 
101,820

 
$
33.56

Performance share awards granted
125,290

 
48.75

 
81,569

 
45.03

 
52,639

 
37.33

Performance share awards vested
(57,581
)
 
36.11

 
(15,344
)
 
31.38

 
(32,746
)
 
32.62

Performance share awards conversion adjustment
45,517

 
36.82

 
—

 
—

 
(15,344
)
 
31.38

Performance share awards outstanding, end of year
285,820

 
$
44.53

 
172,594

 
$
40.70

 
106,369

 
$
36.03
Total share compensation expenses
The breakdown of share compensation expenses by award type is as follows:
 
Years Ended December 31,
 
2016
 
2015
 
2014
Restricted share awards
$
36,887

 
$
35,386

 
$
31,335

Restricted share units
1,285

 
1,160

 
876

Performance share awards
4,735

 
1,795

 
862

Total
$
42,907

 
$
38,341

 
$
33,073