Summary Of Significant Accounting Policies (Schedule Of Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 36,300	$ 14,933	$ 15,511
Less: amounts capitalized	(6,927)	(3,244)	(3,647)
Stock-based compensation expense, net of amounts capitalized	29,373	11,689	11,864
Income Tax Benefit	10,281	4,449	4,342
Stock Options And SARs [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	17,303	(2,116)	1,546
Restricted Stock Awards And Units [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense	$ 18,997	$ 17,049	$ 13,965