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Interest and Finance Costs (Tables)
 6 Months Ended
Jun. 30, 2015
Interest and Finance Costs [Abstract]:  
Interest And Finance Costs
    June 30, 2014     June 30, 2015  
Interest expense     22,427       22,667  
Interest capitalized     (1,795 )     -  
Swap effect     24,384       25,650  
Amortization and write-off of financing costs     3,025       946  
Commitment fees     161       349  
Bank charges and other     160       131  
      48,362       49,743