Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Other Nonoperating Income (Expense)	$ (17,384,000)	$ 1,108,000	$ 219,768,000
Surety bonds	6,600,000
Outstanding letters of credit	41,200,000
Accrual for Environmental Loss Contingencies	36,000	122,000
Ngtl [Member]
Loss Contingencies [Line Items]
Other Nonoperating Income (Expense)	12,800,000
Tarrant County, Texas [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Expense	$ 3,300,000