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Financial Instruments - Additional Information (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Country | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Financial Instruments (Textual) [Abstract] |  |  |  |  |
Cash and cash equivalents |  |  | $ 193,008 |  | $ 317,379
Cash held outside of Canada |  |  | $ 101,000 |  | 89,900
Number of countries that generate box office | Country |  |  | 85 |  |
Foreign Exchange contract settlement date range |  |  | settlement dates throughout 2022 |  |
Estimated loss to be reclassified to earnings within the next twelve months |  |  | $ 200 |  |
Investment in equity securities |  |  | 1,089 |  | 13,633
Investment in equity securities - cost |  |  | $ 15,200 |  |
Equity securities restrictions |  |  | lock-up period of six months |  |
Fixed Income Securities [Member] |  |  |  |  |
Financial Instruments (Textual) [Abstract] |  |  |  |  |
Equity Investment, Debt Securities |  |  | $ 1,100 |  | 1,100
Preferred Stock [Member] | Other Assets [Member] |  |  |  |  |
Financial Instruments (Textual) [Abstract] |  |  |  |  |
Investment in equity securities |  |  | $ 1,000 |  | 1,000
Maoyan [Member] |  |  |  |  |
Financial Instruments (Textual) [Abstract] |  |  |  |  |
Investment in equity securities |  |  |  |  | 12,600
Gain (loss) in fair value of equity securities |  | $ 1,600 |  | $ (900) |
Number of shares sold | shares | 7,949,000 |  |  |  |
Gross proceeds from sale of investment | $ 17,800 |  |  |  |
Gain relating to acquisition cost | 2,600 |  |  |  |
Realized gain on fair value of investment | $ 5,200 |  |  |  |
Maximum [Member] |  |  |  |  |
Financial Instruments (Textual) [Abstract] |  |  |  |  |
Equity securities percentage ownership |  |  | 1.00% |  |
Republic of China [Member] |  |  |  |  |
Financial Instruments (Textual) [Abstract] |  |  |  |  |
Cash held/undistributed earnings |  |  | $ 70,300 |  | $ 77,200

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