Other Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Component of Operating Income [Abstract]
Gain (Loss) on Sale of Property Plant Equipment	$ 67,480	$ 282,006	$ 45,673
Interest Income (Expense), Net	15,889	28,937	8,919
Pennsylvania Turnpike Settlement	9,000	0	0
Equity in Earnings of Affiliates	(33,133)	(27,048)	(24,663)
Royalty Revenue	16,906	16,853	17,969
Right of Way Issuance	4,536	3,966	12,157
Other Nonoperating Income (Expense)	32,019	36,366	29,751
Other Income	$ 178,963	$ 395,176	$ 139,132