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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of nonvested share award activity
The following is a summary of the stock awards activity under our equity incentive plan and related information for the years ended December 31, 2019, 2018, and 2017:
 
 
 
 
Number of Share Awards
 
Weighted-Average
Grant Date
Fair Value Per Share
Outstanding at December 31, 2016
 
 
 
1,135,788

 
$
87.21

 
Granted
 
 
 
688,295

 
$
108.22

 
Vested
 
 
 
(423,705
)
 
$
85.16

 
Forfeited
 
 
 
(5,796
)
 
$
101.45

 
Outstanding at December 31, 2017
 
 
 
1,394,582

 
$
95.79

 
Granted
 
 
 
741,244

 
$
121.20

 
Vested
 
 
 
(403,120
)
 
$
103.83

 
Forfeited
 
 
 
(20,330
)
 
$
106.38

 
Outstanding at December 31, 2018
 
 
 
1,712,376

 
$
105.22

 
Granted
 
 
 
768,625

 
$
134.70

 
Vested
 
 
 
(666,836
)
 
$
96.77

 
Forfeited
 
 
 
(14,480
)
 
$
119.88

 
Outstanding at December 31, 2019
 
 
 
1,799,685

 
$
119.59

 
 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
(In thousands)
 
2019
 
2018
 
2017
Total grant date fair value of stock awards vested
 
$
64,530

 
$
41,854

 
$
36,083
 
Total gross compensation recognized for stock awards
 
$
68,036

 
$
57,341

 
$
42,292
 
Capitalized stock compensation
 
$
24,396

 
$
22,322

 
$
16,682