XML 18 R46.htm IDEA: XBRL DOCUMENT v3.2.0.727
Share-based compensation plans (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
plan
Jun. 30, 2014
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of share-based compensation plans | plan     2  
Vesting period of share-based compensation awards     3 years  
Contractural term of share-based compensation awards     5 years  
Unrecognized compensation cost related to unvested share-based compensation $ 25   $ 25  
Period for recognition for unrecognized compensation cost related to unvested share-based compensation     3 years  
SARs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of share-based compensation awards     3 years  
Contractural term of share-based compensation awards     5 years  
Share-based compensation expense $ (1,200) $ 311 $ (1,200) $ 398