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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency translation adjustments	$ (62,710)	$ (36,188)
Currency impact on long term funding	(5,016)	(182)
Actuarial loss on defined benefit pension plan (note 9)	(3,000)	(5,855)
Unrealized capital loss – investments (note 3)	(450)	(295)
Total	(69,328)	(38,713)
Interest Rate Contract
Accumulated Other Comprehensive Income (Loss) [Line Items]
Hedges	4,658	4,658
Amortization of interest rate hedge	(2,810)	(1,887)
Foreign Exchange Forward
Accumulated Other Comprehensive Income (Loss) [Line Items]
Hedges	$ 0	$ 1,036

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Accumulated Other Comprehensive Income (Loss), Amortization Of Cash Flow Hedges, Effect Net of Tax

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Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Currency Impact on Long Term Funding, Net of Tax

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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