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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Lease expiration date Aug. 31, 2025    
Rent expense $ 17,804 $ 18,446 $ 17,873
Minimum rentals for aggregate lease commitments      
2016 7,707    
2017 5,421    
2018 3,856    
2019 2,607    
2020 1,663    
Thereafter 2,673    
Total 23,927    
Aggregate residual value at lease expiration for vehicle leases 11,674    
Guaranteed aggregate residual value at lease expiration for vehicle leases 9,439    
Liability for the estimated end-of-term loss related to residual value guarantee $ 290    
United Kingdom      
Purchase Commitment      
Facility lease term 10 years    
Future minimum payments due $ 2,776    
Australia      
Purchase Commitment      
Facility lease term 7 years    
Future minimum payments due $ 3,722    
2015 Purchase Commitment      
Purchase Commitment      
Short-term purchase commitment, amount $ 1,792