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Share-based payments (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the Restricted Common Stock Award Activity
A summary of the restricted common stock award activity during the year ended December 31, 2016 is presented below:
 
Shares
 
Weighted-Average Grant-Date Fair Value per Share ($)
 
 
Nonvested balance at January 1, 2016
252,190

 
34.88

Granted
109,903

 
37.34

Adjustment for performance-based shares
(36,997
)
 
32.91

Vested
(83,286
)
 
33.23

Forfeited
(35,483
)
 
35.03

Nonvested balance at December 31, 2016
206,327

 
37.18