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Debt (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Mar. 10, 2016
Jan. 13, 2016
Sep. 12, 2014
Apr. 02, 2013
Jan. 22, 2016
May 31, 2015
May 19, 2014
Feb. 28, 2014
Jan. 31, 2014
Sep. 28, 2012
Aug. 24, 2011
Mar. 16, 2011
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Apr. 29, 2015
Jul. 24, 2014
May 22, 2014
Mar. 19, 2014
Required Minimum Solvency Covenant                             30.00%        
Required Minimum Cash Balance                         $ 19,500   $ 19,500        
Minimum Net Worth Required                         $ 150,000   $ 150,000        
Fair market Value Percentage                             130.00%        
Minimum [Member]                                      
Minimum ratio of EBITDA plus a portion of cash in excess of our minimum liquidity to total interest expense                             1        
Cash and Cash Equivalent Percentage                         5.00%   5.00%        
Maximum [Member]                                      
Minimum ratio of EBITDA plus a portion of cash in excess of our minimum liquidity to total interest expense                             2.25        
First ABN Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                       $ 40,500              
Long-term Line of Credit                       32,000              
Remaining Amount No Longer Available For Borrowing                       $ 8,500              
Repayments of Long-term Lines of Credit       $ 17,900                              
Debt Instrument Maturity Period                       2018              
Second ABN Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                     $ 48,900         $ 10,000      
Second ABN Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Description of Variable Rate Basis           LIBOR plus 4.50%                          
Second ABN Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Description of Variable Rate Basis                     LIBOR plus 3.20%                
DVB Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                   $ 81,850           $ 15,000      
Debt Instrument, Description of Variable Rate Basis           LIBOR plus 4.50%                          
DVB Bank Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Description of Variable Rate Basis                   LIBOR plus 3.75%                  
DVB Bank Facility [Member] | LIBOR [Member] | Tranche II [Member]                                      
Debt Instrument, Description of Variable Rate Basis                 LIBOR plus 2.45%                    
DVB Bank Facility [Member] | LIBOR [Member] | Tranche III [Member]                                      
Debt Instrument, Description of Variable Rate Basis               LIBOR plus 2.45%                      
Joint Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                                 $ 225,300   $ 172,000
Line Of Credit Facility Maximum Borrowing Capacity Increase Amount                                 $ 53,300    
Joint Bank Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Description of Variable Rate Basis             LIBOR plus 2.95%                        
Joint Bank Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Description of Variable Rate Basis             LIBOR plus 3.15%                        
NIBC Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity     $ 13,500                                
NIBC Bank Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Description of Variable Rate Basis     LIBOR plus 2.90%                                
CACIB Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                                   $ 39,000  
Long-term Line of Credit $ 2,300                                    
Debt Instrument Maturity Period                           2022          
Proceeds from Lines of Credit                         $ 25,000            
CACIB Bank Facility [Member] | Additional Financing [Member]                                      
Short-term Debt, Refinanced, Amount $ 25,000                                    
CACIB Bank Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Description of Variable Rate Basis LIBOR plus 2.50%                                    
ABN/DVB Joint Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 213,000                                  
Debt Instrument Maturity Period                           2022          
ABN/DVB Joint Bank Facility [Member] | Future Acquisition [Member]                                      
Short-term Debt, Refinanced, Amount   $ 20,000                                  
ABN/DVB Joint Bank Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Description of Variable Rate Basis   LIBOR plus 2.55%                                  
Nordea/SEB Joint Bank Facility [Memebr]                                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 151,000                                  
Debt Instrument Maturity Period                           2022          
Debt Instrument, Description of Variable Rate Basis         LIBOR plus 2.50%