Debt (Australian NAB Corporate Term Loan And Revolver) (Narrative) (Details) $ in Thousands, AUD in Millions			12 Months Ended
	Dec. 23, 2015 AUD	Jun. 27, 2014 AUD	Dec. 31, 2015 USD ($)	Dec. 23, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Amortization of debt discount	AUD 2.0
Notes payable | $			$ 130,941		$ 164,036
Line of credit facility, term			3 years
Bank Guarantee Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	AUD 5.0			$ 3,600
Facility fee	1.90%
NAB Australian Corporate Term Loan And Revolver Tier 1 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	AUD 61.3	AUD 61.3
Amortization of debt discount		AUD 2.0
Spread on variable interest rate	2.35%	2.35%
NAB Australian Corporate Term Loan And Revolver Tier 2 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	AUD 10.0	AUD 10.0
Spread on variable interest rate	1.50%	1.50%
NAB Australian Corporate Term Loan And Revolver Tier 3 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	AUD 5.0	AUD 5.0
NAB Australian Corporate Term Loan And Revolver Tier 1, 2, 3 [Member]
Debt Instrument [Line Items]
Maturity date			Jun. 30, 2019
Revolving Corporate Markets Loan Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	AUD 66.5			$ 48,500
Spread on variable interest rate	0.95%
Facility fee			0.95%
Maturity date			Jun. 30, 2019