Credit Facility-Expired (Summary Of Outstanding Letters Of Credit And/Or Borrowings) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2014
Line of Credit Facility [Line Items]
Commitment	$ 150,000
In use	851
Citibank Holdings Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment	150,000
In use
Revolving Credit Borrowings [Member]
Line of Credit Facility [Line Items]
In use
Letters Of Credit [Member]
Line of Credit Facility [Line Items]
In use	$ 851
Maturity/Expiry Date	Dec. 31, 2014