Investments, At Equity, And Advances To 50% Or Less Owned Companies (Summarized Financial Information For The Company's Investments, At Equity) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity Method Investment, Summarized Financial Information [Abstract]
Current Fiscal Year End Date	--12-31
Current assets	$ 749,369	$ 458,758
Noncurrent assets	1,387,601	726,034
Current liabilities	345,260	371,597
Noncurrent liabilities	682,348	371,550
Operating Revenues	1,087,637	774,912	691,189
Costs and Expenses: Operating and administrative	955,583	699,061	643,612
Costs and Expenses: Depreciation	61,813	40,440	29,859
Total costs and expenses	1,017,396	739,501	673,471
Gain (Loss) on Asset Dispositions	(397)	0	0
Operating Income	69,844	35,411	17,718
Net Income (Loss)	$ 17,312	$ 4,640	$ (3,252)