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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total property and equipment	$ 186,889us-gaap_PropertyPlantAndEquipmentNet				$ 191,660us-gaap_PropertyPlantAndEquipmentNet				$ 186,889us-gaap_PropertyPlantAndEquipmentNet	$ 191,660us-gaap_PropertyPlantAndEquipmentNet
Total revenue	61,742us-gaap_Revenues	65,031us-gaap_Revenues	69,922us-gaap_Revenues	58,053us-gaap_Revenues	63,540us-gaap_Revenues	65,472us-gaap_Revenues	69,642us-gaap_Revenues	59,567us-gaap_Revenues	254,748us-gaap_Revenues	258,221us-gaap_Revenues	254,430us-gaap_Revenues	254,430us-gaap_Revenues
Australia [Member]
Segment Reporting Information [Line Items]
Total property and equipment	87,536us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU				97,240us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU				87,536us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU	97,240us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_AU
Total revenue									97,329us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_AU	100,399us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_AU		108,320us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_AU
New Zealand [Member]
Segment Reporting Information [Line Items]
Total property and equipment	39,800us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NZ				36,319us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NZ				39,800us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NZ	36,319us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_NZ
Total revenue									26,572us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_NZ	26,310us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_NZ		24,608us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_NZ
United States [Member]
Segment Reporting Information [Line Items]
Total property and equipment	59,553us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				58,101us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				59,553us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US	58,101us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Total revenue									$ 130,847us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	$ 131,512us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US		$ 121,502us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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-Subparagraph (SX 210.5-03.1)

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