Supplemental Disclosures Of Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Disclosures Of Cash Flow Information [Abstract]
Cash paid for interest	$ 44,606	$ 44,343
Cash paid (received) for income taxes	(546)	16,341
Noncash property changes	$ 10,172	$ 35,857