Summary Of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accounting Policies [Abstract]
Total interest costs incurred			$ 61,155	$ 62,515
Interest capitalized			(6,603)	(4,989)
Interest expense	27,147	28,733	54,552	57,526
Cash paid for interest, net of amounts capitalized			57,410	58,132
Cash paid for income taxes			378	255
Dividends contributed to dividend reinvestment plan			$ (894)	$ (946)