Equity Investments (Schedule Of Summarized Aggregated Financial Information Related To The Subsidiaries) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity Investments [Abstract]
Revenues	$ 32,942	$ 53,159	$ 193,521
Operating income	10,058	30,463	97,954
Net income	10,058	30,463	93,215
Current assets	10,314	16,682	39,754
Total assets	508,495	537,251	591,761
Current liabilities	90	706	11,012
Total liabilities	$ 5,006	$ 5,320	$ 27,163