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Financial Commitments (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating leases, future minimum rent payments      
2014 $ 17,886    
2015 15,427    
2016 10,694    
2017 6,493    
2018 2,864    
Thereafter 6,046    
Subtotal 59,410    
Less - Sublease rental agreements (755)    
Operating leases, future minimum rent payments less sublease rental agreements 58,655    
Operating leases, rent expense      
Operating leases, rent expense $ 18,524 $ 17,730 $ 15,866