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Long Term Debt - Total Debt (Table) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument    
Total debt $ 531,705 $ 577,915
Less: Current portion 7,847 5,400
Long-term portion 523,858 572,515
(i) Issued in April 2007 maturing in December, 2019 ($370,000 credit facility)    
Debt Instrument    
Total debt $ 185,975 250,850
Margin 3.00%  
(ii) Issued in March 2008 maturing in December, 2019 ($350,000 credit facility)    
Debt Instrument    
Total debt $ 184,341 233,065
Margin 3.00%  
(iii) Issued in June 2011 maturing in March 2018 ($25,000 credit facility)    
Debt Instrument    
Total debt $ 14,000 19,000
Margin 3.25%  
(iv) Issued in September 2013 maturing in December 2020 ($225,000 credit facility)    
Debt Instrument    
Total debt $ 147,389 $ 75,000
Margin 3.50%