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

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition 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 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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