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Partners' Capital - Additional Information (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 4 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Mar. 26, 2013
shares
Apr. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2013
shares
Aug. 31, 2013
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2013
$ / shares
shares
Sep. 10, 2014
USD ($)
Jul. 24, 2014
USD ($)
Class B convertible preferred unit issued | shares 9,100,000                    
Issuance of common units under Omnibus Incentive Compensation Plan | shares           850,000          
Equity offering | shares   14,555,000   13,685,000 17,250,000            
Net price per common unit | $ / shares   $ 9.53   $ 9.25 $ 10.53            
Net proceeds from equity offering | $   $ 133,327   $ 120,696 $ 173,932            
Issuance of Partnership's units | $   $ 132,588   $ 119,811 173,504 $ 132,588 $ 173,504 $ 192,368      
Stock Repurchased Retired During Period Cash Outflow | $         $ 60,000 0 60,000 $ 0      
Stock Repurchased Cancelled During Period Units | shares         5,950,610            
Advances for vessels under construction - related party | $           $ 18,172 $ 66,641        
Number of vessels           34          
Class B Convertible Preferred Unit Subscription Agreement                      
Class B convertible preferred unit issued | shares     24,655,554                
Conversion price of the Preferred units | $ / shares                 $ 9    
Preferred units conversion rate | shares                 1    
May 23, June 6, 2012 and 2013 Class B Convertible Preferred Units Subscription Agreements Conversion Terms           Commencing on May 23, 2015, in the event the 30-day volume-weighted average trading price ('VWAP') and the daily VWAP of the Common Units on the National Securities Exchange on which the Common Units are listed or admitted to trading exceeds 130% of the then applicable Conversion Price for at least 20 Trading Days out of the 30 consecutive Trading Day period used to calculate the 30-day VWAP (the 'Partnership Mandatory Conversion Event') the Partnership acting pursuant to direction and approval of the Conflicts Committee (following consultation with the full board of directors), shall have the right to convert the Class B Convertible Preferred Units then outstanding in whole or in part into Common Units at the then-applicable Conversion Ratio. The holders of the outstanding Class B Convertible Preferred Units as of an applicable record date shall be entitled to receive, when, as and if authorized by the Partnership's board of directors or any duly authorized committee, out of legally available funds for such purpose, (a) first, the minimum quarterly Class B Convertible Preferred Unit Distribution Rate on each Class B Convertible Preferred Unit and (b) second, any cumulative Class B Convertible Preferred Unit Arrearage then outstanding, prior to any other distributions made in respect of any other Partnership Interests pursuant to the Agreements in cash. The minimum quarterly Class B Convertible Preferred Unit Distribution Rate shall be payable quarterly which is generally expected to be February 10, May 10, August 10 and November 10, or, if any such date is not a business day, the next succeeding business day.          
Class B Convertible Preferred Units                      
Preferred units conversion rate | shares           1          
Number of Class B convertible preferred units converted to common units | shares           1,240,404 4,698,484 5,733,333      
Limited Partners Common                      
Conversion of Partnership's units | $           $ 7,900 $ 36,591 $ 47,258      
Issuance of Partnership's units | $           132,588 173,504 119,811      
General Partner                      
Conversion of Partnership's units | $           2,742 3,696 3,060      
Limited Partners Preferred                      
Conversion of Partnership's units | $           $ (10,642) $ (40,287) (50,318)      
Issuance of Partnership's units | $               $ 72,557      
Underwriters Exercise of Overallotment Options                      
Equity offering | shares   1,755,000   1,785,000 2,250,000            
CMTC                      
Units purchased | shares   1,100,000         332,040        
Common Units converted to General Partner Units | shares           315,908 358,624 349,700      
Interest of CGP in the partnership           2.00% 2.00%        
Master Agreement                      
Advances for vessels under construction - related party | $           $ 7,921       $ 30,224  
Number of vessels           5         5
Contracted price | $                     $ 311,500
Minimum | CMTC | Right waived                      
Distribution target amount per unit | $ / shares           $ 0.2425          
Maximum | CMTC | Right waived                      
Distribution target amount per unit | $ / shares           $ 0.25