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Schedule of fair value of plan assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension plans        
Fair value of plan assets $ 23,162 $ 19,652 $ 15,547 $ 14,457
Level 1
        
Pension plans        
Fair value of plan assets 21,117 16,072    
Level 2
        
Pension plans        
Fair value of plan assets 0 1,534    
Level 3
        
Pension plans        
Fair value of plan assets 2,045 2,046 1,871  
Cash
        
Pension plans        
Fair value of plan assets 1,583 87    
Cash | Level 1
        
Pension plans        
Fair value of plan assets 1,583 87    
Cash | Level 2
        
Pension plans        
Fair value of plan assets 0 0    
Cash | Level 3
        
Pension plans        
Fair value of plan assets 0 0    
U.K. managed funds
        
Pension plans        
Fair value of plan assets 6,459 5,232    
U.K. managed funds | Level 1
        
Pension plans        
Fair value of plan assets 6,459 5,232    
U.K. managed funds | Level 2
        
Pension plans        
Fair value of plan assets 0 0    
U.K. managed funds | Level 3
        
Pension plans        
Fair value of plan assets 0 0    
Overseas managed funds
        
Pension plans        
Fair value of plan assets 5,402 4,869    
Overseas managed funds | Level 1
        
Pension plans        
Fair value of plan assets 5,402 4,869    
Overseas managed funds | Level 2
        
Pension plans        
Fair value of plan assets 0 0    
Overseas managed funds | Level 3
        
Pension plans        
Fair value of plan assets 0 0    
U.K. government bonds
        
Pension plans        
Fair value of plan assets 1,549 1,651    
U.K. government bonds | Level 1
        
Pension plans        
Fair value of plan assets 1,549 1,651    
U.K. government bonds | Level 2
        
Pension plans        
Fair value of plan assets 0 0    
U.K. government bonds | Level 3
        
Pension plans        
Fair value of plan assets 0 0    
Corporate bonds
        
Pension plans        
Fair value of plan assets 6,124 4,233    
Corporate bonds | Level 1
        
Pension plans        
Fair value of plan assets 6,124 4,233    
Corporate bonds | Level 2
        
Pension plans        
Fair value of plan assets 0 0    
Corporate bonds | Level 3
        
Pension plans        
Fair value of plan assets 0 0    
Hedge funds
        
Pension plans        
Fair value of plan assets   1,534    
Hedge funds | Level 1
        
Pension plans        
Fair value of plan assets   0    
Hedge funds | Level 2
        
Pension plans        
Fair value of plan assets   1,534    
Hedge funds | Level 3
        
Pension plans        
Fair value of plan assets   0    
Annuities
        
Pension plans        
Fair value of plan assets 2,045 2,046    
Annuities | Level 1
        
Pension plans        
Fair value of plan assets 0 0    
Annuities | Level 2
        
Pension plans        
Fair value of plan assets 0 0    
Annuities | Level 3
        
Pension plans        
Fair value of plan assets $ 2,045 $ 2,046 $ 1,871