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Commitments and Contingencies (Schedule of Future Minimum Rental Payments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases, Operating [Abstract]      
2019 $ 238,000    
2020 183,000    
2021 144,000    
2022 114,000    
2023 103,000    
Thereafter 268,000    
Total noncancelable operating lease commitments 1,050,000    
Rent expense $ 250,000 $ 238,000 $ 234,000