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Equity Method Investments (Results of Operations of Equity Method Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity Method Investments [Abstract]    
Shipping revenues $ 52,315 $ 52,787
Ship operating expenses (26,369) (28,292)
Income from vessel operations 25,946 24,495
Other income 428 312
Interest expense (10,276) (8,380)
Income tax provision (855) (996)
Net income $ 15,243 $ 15,431