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Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other Assets [Abstract]    
Deferred taxes $ 33,785 $ 35,752
Deposits for noncancelable operating leases 43,375 38,858
Cash surrender value for life insurance policies 37,737 32,286
Other 49,998 29,573
Total other assets $ 164,895 $ 136,469