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Debt (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Mar. 10, 2016
Jan. 13, 2016
Sep. 12, 2014
Apr. 02, 2013
May. 31, 2015
Mar. 19, 2014
Feb. 28, 2014
Jan. 31, 2014
Sep. 28, 2012
Aug. 24, 2011
Mar. 16, 2011
Mar. 31, 2016
Apr. 29, 2015
Jul. 24, 2014
May. 22, 2014
Required Minimum Solvency Covenant                       30.00%      
Required Minimum Cash Balance                       $ 19,900      
Minimum Net Worth Required                       $ 150,000      
Fair market Value Percentage                       130.00%      
Short-term Debt, Refinanced, Amount                       $ 428,000      
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%      
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        
First ABN Facility [Member] | LIBOR [Member] | Tranche I [Member]                              
Debt Instrument, Description of Variable Rate Basis                     LIBOR plus 3.25%        
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    
DVB Bank Facility [Member] | LIBOR [Member]                              
Debt Instrument, Description of Variable Rate Basis                 3.75% above LIBOR            
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           $ 172,000               $ 225,300  
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                        
Debt Instrument Maturity Period                       2021      
NIBC Bank Facility [Member] | LIBOR [Member]                              
Debt Instrument, Description of Variable Rate Basis     2.90% above LIBOR                        
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      
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      
Nordea/SEB Joint Bank Facility [Memebr] | LIBOR [Member]                              
Debt Instrument, Description of Variable Rate Basis   LIBOR plus 2.50%