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Property and Equipment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | $ 46,500 | $ 45,600 | $ 45,800
Property and equipment purchased through accounts payable and accrued liabilities, increased/decreased amount |  |  |  |  | 6,900 | 4,200 | 1,900
Impairment charges (recoveries) | $ 676 | $ 114,020 | $ 88,380 | $ 5,346 | 203,076 | $ 5,346 | $ (35)
Capitalized Software |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Impairment charges (recoveries) |  |  |  |  | $ 1,600 |  |
Audio Visual |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |
Impairment charges (recoveries) |  |  |  | $ 3,800 |  |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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