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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2016
Long-Term Debt [Abstract]  
Bank Loans
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
Bank Loans
  
As of
June 30,
2016
 
  
As of
December 31,
2015
 
  
Margin
(i)
  
Issued in April, 2007 maturing in December, 2019 - $370,000 credit facility (the “2007 credit facility”)
  
$
185,975
  
  
$
185,975
  
  
 
3.00%
(ii)
  
Issued in March, 2008 maturing in December, 2019 - $350,000 credit facility (the “2008 credit facility”)
  
$
181,641
  
  
$
181,641
  
  
 
3.00%
(iii)
  
Issued in June 2011 maturing in March 2018 - $25,000 credit facility -(the “2011 credit facility”)
  
$
14,000
  
  
$
14,000
  
  
 
3.25%
(iv)
  
Issued in September 2013 maturing in December 2020 - (the “2013 credit facility”)
  
$
216,323
  
  
$
190,000
  
  
 
3.50%
 
  
Total long-term debt
  
$
597,939
  
  
$
571,616
  
  
 
 
 
  
Less: Deferred loan issuance costs
  
 
3,321
  
  
 
3,806
  
  
 
 
 
  
Total long-term debt, net
  
$
594,618
  
  
$
567,810
  
  
 
 
 
  
Less: Current portion of long-term debt
  
 
17,354
  
  
 
12,957
  
  
 
 
 
  
Add: Current portion of deferred loan issuance costs
  
 
984
  
  
 
1,035
  
  
 
 
 
 
Long-term debt, net
 
$
 578,248
 
 
$
555,888