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Borrowings (Australian NAB Corporate Loan Facility) (Narrative) (Details) - AUD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 15, 2019 | Dec. 17, 2018 | Dec. 31, 2018
Australian NAB Corporate Loan Facility Tier 1 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 66.5
Spread on variable interest rate |  | 0.95% |
Maturity date |  |  | Jun. 30, 2019
Australian NAB Corporate Loan Facility Tier 2 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 5.0
Spread on variable interest rate |  | 1.90% |
Australian NAB Corporate Loan Facility Tier 3 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date |  |  | Dec. 31, 2023
Subsequent Event [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 120.0 |  |
Subsequent Event [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member] | Bank Guarantee Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 5.0 |  |
Spread on variable interest rate | 1.85% |  |
Subsequent Event [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member] | Core Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 40.0 |  |
Subsequent Event [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of credit facility, maximum borrowing capacity | $ 80.0 |  |
Subsequent Event [Member] | Minimum [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Spread on variable interest rate | 0.85% |  |
Subsequent Event [Member] | Maximum [Member] | Australian NAB Corporate Loan Facility Tier 3 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Spread on variable interest rate | 1.30% |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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