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Financial Instruments | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Financial Instruments | Financial Instruments As at December 31, 2018, the carrying amount and fair value of the Company’s financial instruments were as follows:
| Level 1 $ |  | Level 2 $ |  | Level 3 $
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Commercial paper | — |  | — |  |  | 4,994 |  | 4,994 |  |  | — |  | — |
Repurchase agreements | — |  | — |  |  | 60,000 |  | 60,005 |  |  | — |  | — |
Marketable securities: |  |  |  |  |  |  |  |
U.S. term deposits | 127,500 |  | 128,241 |  |  | — |  | — |  |  | — |  | — |
U.S. federal bonds | 230,898 |  | 231,299 |  |  | — |  | — |  |  | — |  | — |
Canadian federal bonds | 19,967 |  | 19,962 |  |  | — |  | — |  |  | — |  | — |
Corporate bonds and commercial paper | — |  | — |  |  | 1,180,622 |  | 1,182,437 |  |  | — |  | — |
Liabilities: |  |  |  |  |  |  |  |
Derivative liabilities: |  |  |  |  |  |  |  |
Foreign exchange forward contracts | — |  | — |  |  | 12,216 |  | 12,216 |  |  | — |  | — |
The fair values above include accrued interest of $5,109, which is excluded from the carrying amounts. The accrued interest is included in Trade and other receivables in the Consolidated Balance Sheets. As at December 31, 2017, the carrying amount and fair value of the Company’s financial instruments were as follows:
| Level 1 $ |  | Level 2 $ |  | Level 3 $
| Carrying Amount | Fair Value |  | Carrying Amount | Fair Value |  | Carrying Amount | Fair Value
Assets: |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Corporate bonds and commercial paper | — |  | — |  |  | 9,965 |  | 9,965 |  |  | — |  | — |
Marketable securities: |  |  |  |  |  |  |  |
U.S. term deposits | 65,000 |  | 65,284 |  |  | — |  | — |  |  | — |  | — |
U.S. federal bonds | 119,074 |  | 119,057 |  |  | — |  | — |  |  | — |  | — |
Canadian federal bonds | 19,945 |  | 19,940 |  |  | — |  | — |  |  | — |  | — |
Corporate bonds and commercial paper | — |  | — |  |  | 592,343 |  | 593,554 |  |  | — |  | — |
Derivative assets: |  |  |  |  |  |  |  |
Foreign exchange forward contracts | — |  | — |  |  | 4,503 |  | 4,503 |  |  | — |  | — |
Liabilities: |  |  |  |  |  |  |  |
Derivative liabilities: |  |  |  |  |  |  |  |
Foreign exchange forward contracts | — |  | — |  |  | 795 |  | 795 |  |  | — |  | — |
The fair values above include accrued interest of $2,015, which is excluded from the carrying amounts. The accrued interest is included in Trade and other receivables in the Consolidated Balance Sheets. All cash equivalents and marketable securities mature within one year of the consolidated balance sheet date. As at December 31, 2018 the Company held foreign exchange forward contracts to convert USD into CAD, with a total notional value of $276,696 (December 31, 2017 - $182,464), to fund a portion of its operations. The foreign exchange forward contracts have maturities of twelve months or less. The fair value of foreign exchange forward contracts and corporate bonds was based upon Level 2 inputs, which included period-end mid-market quotations for each underlying contract as calculated by the financial institution with which the Company has transacted. The quotations are based on bid/ask quotations and represent the discounted future settlement amounts based on current market rates. There were no transfers between Levels 1, 2 and 3 during the years ended December 31, 2018 and December 31, 2017. Derivative Instruments and Hedging The Company has a hedging program to mitigate the impact of foreign currency fluctuations on future cash flows and earnings. Under this program the Company has entered into foreign exchange forward contracts with certain financial institutions and designated those hedges as cash flow hedges. As of December 31, 2018, $12,216 of unrealized losses related to changes in the fair value of foreign exchange forward contracts designated as cash flow hedges were included in accumulated other comprehensive loss and current liabilities, on the consolidated balance sheet. This amount is expected to be reclassified into earnings over the next twelve months. In the year ended December 31, 2018, $4,170 of realized losses (December 31, 2017 - realized gains of $3,398) related to the maturity of foreign exchange forward contracts designated as cash flow hedges were included in operating expenses. Under the current hedging program, the Company is hedging cash flows associated with payroll and facility costs.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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