Business Segments And Geographic Area Information (Schedule Of Operating Property And Revenue By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total property and equipment	$ 191,660				$ 202,778				$ 191,660	$ 202,778
Total revenue	63,540	65,472	69,642	59,567	65,117	63,934	62,948	62,431	258,221	254,430	244,979
Australia [Member]
Segment Reporting Information [Line Items]
Total property and equipment	97,240				106,020				97,240	106,020
Total revenue									100,399	108,320	110,742
New Zealand [Member]
Segment Reporting Information [Line Items]
Total property and equipment	36,319				35,456				36,319	35,456
Total revenue									26,310	24,608	22,247
United States [Member]
Segment Reporting Information [Line Items]
Total property and equipment	58,101				61,302				58,101	61,302
Total revenue									$ 131,512	$ 121,502	$ 111,990