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Borrowings (Australian NAB Corporate Loan Facility) (Narrative) (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 23, 2015
AUD ($)
Dec. 31, 2017
Dec. 23, 2015
USD ($)
Debt Instrument [Line Items]      
Amortization of debt discount $ 2.0    
Bank Guarantee Facility [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 5.0   $ 3.6
Facility fee 1.90%    
Australian NAB Corporate Loan Facility Tier 1 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 61.3    
Spread on variable interest rate 2.35%    
Australian NAB Corporate Loan Facility Tier 2 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 10.0    
Spread on variable interest rate 1.50%    
Australian NAB Corporate Loan Facility Tier 3 [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 5.0    
Revolving Corporate Markets Loan Facility [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 66.5   $ 48.1
Spread on variable interest rate 0.95%    
Facility fee   0.95%  
Maturity date   Jun. 30, 2019