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Track Maintenance Agreement
9 Months Ended
Sep. 30, 2011
Track Maintenance Agreement [Abstract] 
Track Maintenance Agreement
7.   Track Maintenance Agreement:
    In the second quarter of 2011, the Company entered into a track maintenance agreement with an unrelated third party customer (“Shipper”). The Shipper paid for qualifying railroad track maintenance expenditures during 2011 in consideration of the assignment of railroad track miles which permits the Shipper to claim certain federal tax credits pursuant to Internal Revenue Code Section 45G. During 2011, the Company received $869 thousand, net of related expenses and credits, which offsets maintenance of way expenses. Since the authorizing federal legislation for 2010 track maintenance credits was not renewed by Congress until December 2010, no amounts were received during the three and nine months ended September 30, 2010 for 2010 track maintenance credits.