Derivative instruments (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Location and fair value amount of derivative instruments reported on the balance sheet

The following table summarizes information on the classification and amount of the fair value of derivatives designated as hedging instruments on the consolidated balance sheets at March 31, 2014 and December 31, 2013:

	As at March 31, 2014						As at December 31, 2013
Derivatives designated as hedging instruments:	Net notional exposure		Asset Derivative at Fair Value (a)		Liability Derivative at Fair Value (a)		Net notional exposure		Asset Derivative at Fair Value (a)		Liability Derivative at Fair Value (a)
Foreign currency forward contracts	$	151,853	$	3,839	$	477	$	163,576	$	1,167	$	2,313
Interest rate swap contracts	$	552,263	$	—	$	867	$	552,263	$	—	$	911

(a) Asset and liability derivatives are classified within other assets and accounts payable and accrued expenses respectively on the Consolidated Balance Sheets.

Location and amount of gains and losses related to derivative instruments reported on in the income statement

The following table provides the total impact on earnings, recognized in income within foreign exchange gains (losses), relating to the derivative instruments formally designated as fair value hedges along with the impact of the related hedged items for the three months ended March 31, 2014 and 2013:

Foreign currency forward contracts	Three Months Ended March 31, 2014			Three Months Ended March 31, 2013
Amount of gain (loss) recognized in income on derivative	$	3,303		$	1,261
Amount of gain (loss) on hedged item recognized in income attributable to risk being hedged	$	(3,303	)	$	(1,261	)
Amount of gain (loss) recognized in income on derivative (ineffective portion)	$	—		$	—

The following table provides the total impact on other comprehensive income (loss) and earnings relating to the derivative instruments formally designated as cash flow hedges along with the impact of the related hedged items for the three months ended March 31, 2014 and 2013:

Interest rate swap contracts	Three Months Ended March 31, 2014			Three Months Ended March 31, 2013
Amount of effective portion recognized in other comprehensive income	$	3,208		$	1,608
Amount of effective portion subsequently reclassified to earnings	$	(3,208	)	$	(1,608	)
Amount of ineffective portion excluded from effectiveness testing	$	—		$	—