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Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 7 Months Ended 9 Months Ended
Jun. 12, 2014
Apr. 02, 2013
May. 31, 2015
Apr. 29, 2015
Mar. 31, 2015
Dec. 31, 2014
Aug. 31, 2014
Jun. 30, 2014
May. 22, 2014
Mar. 19, 2014
Feb. 28, 2014
Jan. 31, 2014
Oct. 31, 2012
Jun. 28, 2012
Aug. 24, 2011
Mar. 16, 2011
Aug. 31, 2015
Sep. 30, 2015
Jul. 24, 2014
Required Minimum Solvency Covenant                                   30.00%  
Required Minimum Cash Balance                                   $ 19,500  
Minimum Net Worth Required                                   $ 150,000  
Minimum ratio of EBITDA plus a portion of cash in excess of our minimum liquidity to total interest expense                                   2.25  
Minimum [Member]                                      
Cash and Cash Equivalent Percentage                                   5.00%  
Fair market Value Percentage                                   125.00%  
Maximum [Member]                                      
Debt Instrument Corporate Leverage Percentage                                   75.00%  
Fair market Value Percentage                                   150.00%  
First ABN AMRO 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 Date                                   Dec. 31, 2018  
Debt Instrument, Payment Terms                               Principal repayments on loans are made on a quarterly basis.      
First ABN AMRO Facility [Member] | LIBOR [Member] | Tranches [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                               3.25%      
Second ABN AMRO Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity       $ 10,000                     $ 48,900        
Debt Instrument, Maturity Date                                   Dec. 31, 2018  
Debt Instrument, Payment Terms       Principal repayments on loans are made on a quarterly basis, starting in July 2016, with a balloon payment payable with the final instalment.                     Principal repayments on loans are made on a quarterly basis, with a balloon payment payable with the final instalment.        
Second ABN AMRO Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Basis Spread on Variable Rate     4.50%                                
Second ABN AMRO Facility [Member] | LIBOR [Member] | Tranches [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                             3.20%        
DVB Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity       $ 15,000                   $ 81,850          
Debt Instrument, Payment Terms       Principal repayments on loans are made on a quarterly basis, starting in August 2016, with a balloon payment payable with the final instalment.                   Principal repayments on loans are made on a quarterly basis, with a balloon payment payable with the final instalment          
DVB Bank Facility [Member] | Tranche I [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2019  
DVB Bank Facility [Member] | Tranche II [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
DVB Bank Facility [Member] | Tranche III [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
DVB Bank Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Basis Spread on Variable Rate     4.50%                                
DVB Bank Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                         3.75%            
DVB Bank Facility [Member] | LIBOR [Member] | Tranche II [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                       2.45%              
DVB Bank Facility [Member] | LIBOR [Member] | Tranche III [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                     2.45%                
Joint Debt Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                   $ 172,000                 $ 225,300
Line Of Credit Facility Maximum Borrowing Capacity Increase Amount                                     $ 53,300
Debt Instrument, Unused Borrowing Capacity, Amount                                   $ 41,800  
Debt Instrument, Payment Terms                   Principal repayments on loans are made on a quarterly basis, with a balloon payment payable with the final instalment.                  
Joint Debt Facility [Member] | Tranche I [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Joint Debt Facility [Member] | Tranche II [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Joint Debt Facility [Member] | Tranche III [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Joint Debt Facility [Member] | Tranche IV [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Joint Debt Facility [Member] | Tranche V [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Joint Debt Facility [Member] | Tranche VI [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Joint Debt Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Basis Spread on Variable Rate             2.95%                   3.15%    
Joint Debt Facility [Member] | LIBOR [Member] | Tranche II [Member]                                      
Debt Instrument, Basis Spread on Variable Rate             2.95%                   3.15%    
Joint Debt Facility [Member] | LIBOR [Member] | Tranche III [Member]                                      
Debt Instrument, Basis Spread on Variable Rate               2.95%                 3.15%    
Joint Debt Facility [Member] | LIBOR [Member] | Tranche IV [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                                 3.15%    
Joint Debt Facility [Member] | LIBOR [Member] | Tranche V [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                                 3.15%    
Joint Debt Facility [Member] | LIBOR [Member] | Tranche VI [Member]                                      
Debt Instrument, Basis Spread on Variable Rate                                 3.15%    
NIBC Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity $ 13,500                                    
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
Debt Instrument, Payment Terms Principal repayments on the loan are made on a quarterly basis, with a balloon payment payable with the final instalment.                                    
NIBC Bank Facility [Member] | LIBOR [Member]                                      
Debt Instrument, Basis Spread on Variable Rate               2.90%                      
CACIB Bank Facility [Member]                                      
Line of Credit Facility, Maximum Borrowing Capacity                 $ 39,000                    
Debt Instrument, Payment Terms                 Principal repayments on loans are made on a quarterly basis, with a balloon payment payable with the final instalment.                    
CACIB Bank Facility [Member] | Tranche I [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2021  
CACIB Bank Facility [Member] | Tranche II [Member]                                      
Debt Instrument, Maturity Date                                   Dec. 31, 2022  
CACIB Bank Facility [Member] | LIBOR [Member] | Tranche I [Member]                                      
Debt Instrument, Basis Spread on Variable Rate           3.05%                          
CACIB Bank Facility [Member] | LIBOR [Member] | Tranche II [Member]                                      
Debt Instrument, Basis Spread on Variable Rate         3.05%