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Derivative Instruments - Additional Information (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Aug. 05, 2016
AUD
Aug. 05, 2016
CAD
Dec. 31, 2015
USD ($)
Derivative [Line Items]          
Derivative assets $ 0 $ 0     $ 0
Unrealized losses in net earnings $ 0 $ 0      
Subsequent Event | Foreign Exchange Contracts | Designated as Hedging          
Derivative [Line Items]          
Notional amount     AUD 63,000,000 CAD 50,000,000