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Basis of Presentation and General Information (Details)
 3 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Jun. 20, 2016
Jul. 11, 2014
USD ($)
$ / shares
shares
Nov. 05, 2014
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Aug. 19, 2014
Vessels [Line Items]                  
Date of Incorporation         Dec. 13, 2006        
Payments to acquire property plant and equipment         $ 396,154,000 $ 473,917,000 $ 518,447,000    
Write-off of deferred finance costs     $ 3,003,000            
Average closing market price | $ / shares     $ 59.27            
Interest expense         40,449,000 35,969,000 15,362,000    
Acquisition related costs     $ 9,364,000            
Shares to acquire business | shares     10,820,840            
Daily Management Fee             750    
Share based compensation     $ 1,808,000   $ 4,166,000 $ 2,684,000 5,834,000    
Reverse stock split                  
Vessels [Line Items]                  
Reverse stock split, Conversion ratio   5              
Oceanbulk                  
Vessels [Line Items]                  
Shares to acquire business | shares     9,679,153            
Heron Ventures Ltd                  
Vessels [Line Items]                  
Payments to acquire property plant and equipment             25,000,000    
Shares to acquire vessels | shares     423,141            
Value of common shares issued for acquisition of Heron Vessels             $ 25,080,000    
Pappas Companies                  
Vessels [Line Items]                  
Shares to acquire business | shares     718,546            
Vessels in operation                  
Vessels [Line Items]                  
Assets fair value adjustment     $ 79,465,000            
Vessels in operation | Oceanbulk                  
Vessels [Line Items]                  
Number of vessels acquired     12            
Vessels under construction                  
Vessels [Line Items]                  
Assets fair value adjustment     $ 158,523,000            
Vessels under construction | Oceanbulk                  
Vessels [Line Items]                  
Number of contracts for Newbuildings acquired     25            
Kamsarmax vessels                  
Vessels [Line Items]                  
Number of vessels acquired                 14
Kamsarmax vessels | Heron Ventures Ltd                  
Vessels [Line Items]                  
Number of vessels acquired     2            
Star Gwyneth                  
Vessels [Line Items]                  
DWT         82,790        
Year Built         2006        
Star Angelina                  
Vessels [Line Items]                  
DWT         82,981        
Year Built         2006        
ABYO Oprah                  
Vessels [Line Items]                  
DWT     82,551            
ABYO Audrey                  
Vessels [Line Items]                  
DWT     175,125            
Serenity I                  
Vessels [Line Items]                  
DWT             53,688    
Daily Management Fee $ 500                
Year Built             2006    
Astakos                  
Vessels [Line Items]                  
DWT         58,722        
Year Built         2012        
Heron Convertible Loan                  
Vessels [Line Items]                  
Convertible loan receivable, outstanding amount     $ 23,680,000            
Conversion ratio       0.5          
Write off, Loan receivable     23,680,000            
Convertible loan receivable, outstanding amount net of write-offs     0            
Above market time charters | Madredeus and Amami                  
Vessels [Line Items]                  
Above market time charters     $ 1,967,000            
Number of time charters     2            
Business combination adjustments                  
Vessels [Line Items]                  
Interest expense             $ 1,816,000 $ 1,412,000  
Acquisition related costs             $ 12,757,000    
Significant charterers                  
Vessels [Line Items]                  
Accounts receivable         $ 452,000