v3.3.1.900
Share Compensation and Pension Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 18, 2014
Feb. 19, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares reserved for issuance under the Plan (in shares)     10,000,000      
Volatility, maximum term     7 years 7 months 6 days      
Volatility, maximum     37.60% 51.40% 51.40%  
Weighted average grant date fair value (in dollars per share)     $ 2.13 $ 2.11   $ 2.03
Unrecognized compensation cost related to non-vested share-based compensation arrangements     $ 125 $ 235    
Period of recognition (in years)     1 year 29 days      
Proceeds from stock options exercised     $ 3,318 592 $ 1,776  
Share-based expense from the adoption of ASC Topic 718     2,938 3,334 2,205  
Defined contribution plans expense     $ 1,740 2,809 2,892  
Vesting period 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)     2 years      
Vesting period 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)     3 years      
Share options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Employee service period     4 years      
Expiration period     10 years      
Share options | Vesting period 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage     25.00%      
Share options | Vesting period 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage     6.25%      
Performance-Based Restricted Share Units | Performance Cycle            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period (in years)     3 years      
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to non-vested share-based compensation arrangements     $ 975      
Period of recognition (in years)     1 year 8 months 5 days      
Restricted Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost related to non-vested share-based compensation arrangements     $ 352      
Period of recognition (in years)     1 year 9 months 26 days      
CEO Non-Performance-Based Restricted Share Units February 2013 | CEO Non-Performance-Based Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of units vested     $ 500 500 $ 0  
CEO Non-Performance-Based Restricted Share Units February 2014 | CEO Non-Performance-Based Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of units vested     266 266    
Non-CEO Discretionary Non-Performance-Based Restricted Shares February 2013 | Non-CEO Non-Performance-Based Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of units vested     479 479    
Non-CEO Discretionary Non-Performance-Based Restricted Shares February 2013 | Non-CEO Non-Performance-Based Restricted Share Units | Vesting period 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   50.00%        
Non-CEO Discretionary Non-Performance-Based Restricted Shares February 2013 | Non-CEO Non-Performance-Based Restricted Share Units | Vesting period 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage   50.00%        
Non-CEO Discretionary Non-Performance-Based Restricted Shares February 2014 | Non-CEO Non-Performance-Based Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of units vested     $ 219 $ 0    
Non-CEO Discretionary Non-Performance-Based Restricted Shares February 2014 | Non-CEO Non-Performance-Based Restricted Share Units | Vesting period 1            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage 50.00%          
Non-CEO Discretionary Non-Performance-Based Restricted Shares February 2014 | Non-CEO Non-Performance-Based Restricted Share Units | Vesting period 2            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage 50.00%