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Share Capital (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 11 Months Ended 12 Months Ended
Aug. 20, 2014
USD ($)
shares
Mar. 25, 2019
Nov. 15, 2018
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Class of Stock [Line Items]            
Classes of common shares       2    
Common Shares, Conversion Basis       As a consequence of the completion of the Poseidon Transaction, the outstanding shares of Class B common shares converted to Class A common shares on a one-for-one basis on January 2, 2019 and were also retrospectively adjusted for the one-for-eight reverse stock split.    
Common Shares [Member]            
Class of Stock [Line Items]            
Shares Issued During Period, Shares, New Issues | shares     3,005,603 3,065,988    
Shares Issued During Period, Shares, Share-based Compensation | shares         4,266 4,266
Common Shares [Member] | Reverse Stock Split [Member] | Subsequent Event [Member]            
Class of Stock [Line Items]            
Shareholders' Equity Note, Reverse Stock Split, Conversion Ratio   8        
Common Class A [Member]            
Class of Stock [Line Items]            
Convertible Preferred Shares, Shares to be Issued upon Conversion | shares       12,955,187    
Common Class A [Member] | Director [Member] | 2015 Plan [Member]            
Class of Stock [Line Items]            
Shares issued | shares     60,425   4,266 4,266
Shares issued as percentage of directors base fee         20.00% 20.00%
Shares issued notional value per share | $ / shares         $ 32 $ 32
Series B Preferred Shares [Member]            
Class of Stock [Line Items]            
Depositary shares issued | shares 1,400,000          
Preferred shares dividend rate percentage       8.75%    
Preferred shares issuance term description       On August 20, 2014, the Company issued 1,400,000 depositary shares, each of which represents 1/100th of one share of the Company’s 8.75% Series B Cumulative Redeemable Perpetual Preferred Shares (the “Series B Preferred Shares”).    
Preferred Shares, Redemption Terms       At any time after August 20, 2019 (or within 180 days after the occurrence of a fundamental change), the Series B Preferred Shares may be redeemed, at the discretion of the Company, in whole or in part, at a redemption price of $2,500.00 per share (equivalent to $25.00 per depositary share).    
Redemption price per share | $ / shares       $ 2,500.00    
Redemption price per depositary share | $ / shares       25.00    
Net proceeds from issuance | $ $ 33,497          
Preferred shares, par value | $ / shares       $ 0.01 $ 0.01 $ 0.01
Series B Preferred Shares [Member] | Third Quarter, 2014 [Member]            
Class of Stock [Line Items]            
Dividend declaration date       Sep. 22, 2014    
Series C Preferred Shares [Member]            
Class of Stock [Line Items]            
Preferred shares, par value | $ / shares       $ 0.01    
Series C Preferred Shares [Member] | Preferred Shares [Member]            
Class of Stock [Line Items]            
Series C Preferred shares issued | shares       250,000    
Preferred shares, par value | $ / shares       $ 0.01    
Preferred Shares Number Of Voting Rights       38.75    
Convertible Preferred Shares, Terms of Conversion       Each Series C Preferred Share carries 38.75 votes and are convertible in certain circumstances to a total of 12,955,187 Class A common shares.