Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Forward Contracts Outstanding, Estimated Fair Value, Change in Fair Value and Realized Gains of Derivative Instruments

The following table sets forth the estimated fair value of derivative instruments recorded within other assets on the unaudited condensed consolidated balance sheet as at March 31, 2014 and December 31, 2013, respectively:

Foreign Exchange Forward Contract	Contract Date	Settlement Date	Contract Amount		Settlement Amount		Fair Value as at
							March 31, 2014		December 31, 2013
Australian dollar	November 26, 2013	January 3, 2014		AU$45,000		$41,036	$	—	$	779
U.S Dollar	July 1, 2013	January 3, 2014		$40,887		AU$45,000		—		(630	)
							$	—	$	149

The following table sets forth the changes in realized gains (losses) on derivative instruments recorded in net earnings for the periods ended March 31, 2014 and 2013, respectively:

Foreign Exchange Forward Contract	Contract Date	Settlement Date	Contract Amount		Settlement Amount		Net Foreign Exchange Gains (Losses)
							March 31, 2014			March 31, 2013
Australian dollar	November 26, 2013	January 3, 2014		AU$45,000		$41,036	$	(130	)	$	—
U.S Dollar	July 1, 2013	January 3, 2014		$40,887		AU$45,000		130			—
Australian dollar	February 8, 2012	May 10, 2013		AU$35,000		$36,099		—			(150	)
British pound	March 6, 2012	March 6, 2013		UKP17,000		$26,611		—			1,023
							$	—		$	873