Quarterly report pursuant to Section 13 or 15(d)

Investments, at Equity, Advances to 50% or Less Owned Companies (Details)

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Investments, at Equity, Advances to 50% or Less Owned Companies (Details) (Dart Holding Company Ltd. [Member], USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dart Holding Company Ltd. [Member]
        
Schedule of Equity Method Investments [Line Items]        
Operating Revenues $ 10,873 $ 13,130 $ 21,649 $ 24,712
Operating and administrative 8,348 8,645 16,107 17,196
Depreciation 1,284 1,359 2,582 2,709
Total Costs and Expenses 9,632 10,004 18,689 19,905
Operating Income 1,241 3,126 2,960 4,807
Net Income $ 929 $ 3,563 $ 2,104 $ 1,469