Summary Of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Total interest costs incurred			$ 91,208	$ 93,213
Interest capitalized			(10,894)	(7,469)
Interest expense	25,762	28,218	80,314	85,744
Cash paid for interest, net of amounts capitalized			85,240	89,959
Cash paid for income taxes			408	(1,144)
Dividends contributed to dividend reinvestment plan			$ (1,325)	$ (1,395)