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Long-Term Debt - Total Debt (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument    
Total long-term debt $ 571,616 $ 577,915
Less: Deferred loan issuance costs 3,806 3,242
Total long-term debt, net 567,810 574,673
Less: Current portion of long-term debt 12,957 5,400
Add: Current portion of deferred loan issuance costs 1,035 821
Long-term debt, net 555,888 570,094
(i) Issued in April 2007 maturing in December, 2019 - $370,000 credit facility (the ''2007 credit facility'')    
Debt Instrument    
Total long-term debt $ 185,975 250,850
Margin 3.00%  
(ii) Issued in March, 2008 maturing in December, 2019 - 2008 credit facility    
Debt Instrument    
Total long-term debt $ 181,641 233,065
Margin 3.00%  
(iii) Issued in June 2011 maturing in March 2018 - $25,000 credit facility (the ''2011 credit facility'')    
Debt Instrument    
Total long-term debt $ 14,000 19,000
Margin 3.25%  
(iv) Issued in September 2013 maturing in December 2020 - 2013 credit facility    
Debt Instrument    
Total long-term debt $ 190,000 $ 75,000
Margin 3.50%