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Significant Accounting Policies and Recent Accounting Pronouncements (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Property, Plant and Equipment [Line Items]          
Impairment of Long-Lived Assets Held-for-use   $ 0 $ 102,924,000    
Restricted Cash and Cash Equivalents, Noncurrent   16,500,000 20,000,000    
Vessels' net book value   643,450,000 716,178,000 $ 882,297,000  
Voyage expenses   5,570,000 13,525,000 13,542,000  
Receivables [Abstract]          
Provision for doubtful accounts   $ 0 0    
Property Plant And Equipment Impairment Or Disposal [Abstract]          
Time period for measurement of time charter rate, input for calculation of vessel impairments 10 years 10 years      
Number of years excluded from calculation of average time charter rates 3 years        
Number of Reportable Segments | segment   1      
Provision for Doubtful Accounts   $ 300,000 0 0  
Impaired Vessels          
Property, Plant and Equipment [Line Items]          
Vessels' net book value       48,966,000 $ 258,425,000
Property Plant And Equipment Impairment Or Disposal [Abstract]          
Unamortized deferred costs       1,033,000 $ 1,343,000
Vessels with indicators of impairment          
Property, Plant and Equipment [Line Items]          
Vessels' net book value   75,059      
Building [Member]          
Property, Plant and Equipment [Line Items]          
Impairment of Long-Lived Assets Held-for-use   $ 0 $ 0 $ 0  
Property, Plant and Equipment, Estimated Useful Lives   P55Y      
Vehicles [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Estimated Useful Lives   P10Y      
Office Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Estimated Useful Lives   P5Y      
Computer Equipment [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Estimated Useful Lives   P3Y      
Vessels [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Estimated Useful Lives   P25Y