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Accounting Policies (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
USD ($)
vessel
Jun. 30, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Administrative expenses $ 24,092 $ 18,269
Number of vessels in sale and leaseback transaction | vessel 8  
Previously Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Administrative expenses   22,546
Restatement Adjustment    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Administrative expenses   $ (4,277)