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Debt (Schedule of Maturities of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 2,044  
2020 10,801  
2021 1,611  
2022 101,683  
2023 113,863  
Thereafter 394,288  
Total $ 624,290 $ 619,444