Notes Payable (New Zealand Corporate Credit Facility) (Narrative) (Details) In Millions, unless otherwise specified	12 Months Ended		12 Months Ended
Dec. 31, 2014 Previous New Zealand Corporate Credit Facility [Member]	Feb. 08, 2012 Previous New Zealand Corporate Credit Facility [Member] USD ($)	Feb. 08, 2012 Previous New Zealand Corporate Credit Facility [Member] NZD	Dec. 31, 2014 New Zealand Corporate Credit Facility [Member] USD ($)	Dec. 31, 2014 New Zealand Corporate Credit Facility [Member] NZD
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 36.9	45.0	$ 32.8	40.0
Line of credit facility, term				3 years	3 years
Line of credit facility, decrease in maximum borrowing capacity				$ 4.1	5.0
Increase in spread on variable interest rate	0.55%
Spread on variable interest rate				2.00%	2.00%
Line of credit facility charge	0.30%			0.40%	0.40%

Debt Instrument, Increase Decrease In Basis Spread On Variable Rate

No definition available.

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- Definition

Line Of Credit Facility Charge, Percentage

+ References

No definition available.

+ Details

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- Definition

Line Of Credit Facility, Increase Decrease In Maximum Borrowing Capacity

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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