Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Foreign Currency Hedge Contracts (Details)

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Commitments and Contingencies - Foreign Currency Hedge Contracts (Details) - Dec. 31, 2015
ZAR in Millions, NZD in Millions, $ in Millions
NZD
USD ($)
ZAR
Derivative [Line Items]      
Derivative, Notional Amount   $ 11.2  
South Africa, Rand      
Derivative [Line Items]      
Derivative, Notional Amount | ZAR     ZAR 142.4
United States of America, Dollars      
Derivative [Line Items]      
Derivative, Notional Amount   $ 16.6  
New Zealand, Dollars      
Derivative [Line Items]      
Derivative, Notional Amount | NZD NZD 25.2