XML 132 R102.htm IDEA: XBRL DOCUMENT v3.20.1
Share-based compensation (Summary of Activity of Stock Options) (Details) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-average grant-date fair value      
Additional paid-in capital $ 1,111 $ 844 $ 750
2011 Equity Incentive Plan      
Units      
Units, beginning balance (in shares) 491,073 634,489 776,475
Units, expired (in shares) (216,633) (143,416) (141,986)
Units, ending balance (in shares) 274,440 491,073 634,489
Units, exercisable (in shares) 274,440    
Weighted-average strike price      
Units, beginning balance (in dollars per share) $ 12.26 $ 14.28 $ 15.55
Units, expired (in dollars per share) 14.35 21.20 21.20
Units, ending balance (in dollars per share) 10.62 12.26 14.28
Units, exercisable (in dollars per share) 10.62    
Weighted-average grant-date fair value      
Units, beginning balance (in dollars per share) 3.81 4.28 4.46
Units, expired (in dollars per share) 5.13 5.89 5.28
Units, ending balance (in dollars per share) 2.77 $ 3.81 $ 4.28
Units, exercisable (in dollars per share) $ 2.77    
Number of units outstanding 274,440    
Weighted-average grant-date fair market value per unit (in dollars per share) $ 2.77    
Total grant-date fair value $ 760    
Weighted-average accumulated percentage of service 100.00%    
Stock-based compensation recognized in Additional paid-in capital $ 760