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
Mar. 31, 2013
Mar. 31, 2012
Dart Holding Company Ltd. [Member]
    
Schedule of Equity Method Investments [Line Items]    
Operating Revenues $ 10,776 $ 11,582
Operating and administrative 7,759 8,551
Depreciation 1,298 1,349
Total Costs and Expenses 9,057 9,900
Operating Income 1,719 1,682
Net Income (Loss) $ 1,175 $ (312)