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Supplemental Information to Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | [3] | Sep. 30, 2021 | Sep. 30, 2020
Schedule Of Cash Flow Supplemental [Line Items] |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  | $ 89,834 | $ 53,364
Cash paid (refunds received) for income taxes, net |  |  |  |  |  | (136,937) | (108,776)
Cash deposited in restricted accounts | [1] | $ 7,300 |  |  |  | 7,300 |
Noncash investing and financing activities: |  |  |  |  |  |  |
Change in accounts payable and accrued expenses for the acquisition of theatre properties and equipment | [2] |  |  |  |  | (2,409) | (7,933)
Investment in NCM – receipt of common units (see Note 9) |  |  |  |  |  | 10,237 | 3,620
Adjustment to accrued dividends on unvested restricted stock unit awards |  |  | $ 2 |  | $ 256 | 2 | (257)
NCM |  |  |  |  |  |  |
Noncash investing and financing activities: |  |  |  |  |  |  |
Interest expense - NCM (see Note 9) |  | $ (5,926) |  | $ (5,901) |  | $ (17,723) | $ (17,726)
[1] | Represents cash deposited in a collateral account during the period to support the issuance of letters of credit to lenders. See further discussion at Note 7.
[2] | Additions to theatre properties and equipment included in accounts payable as of September 30, 2021 and December 31, 2020 were $25,841 and $28,250, respectively.
[3] | On March 20, 2020 the Company paid a $0.36 dividend per common share to stockholders of record on March 6, 2020. Additionally, the Company accrued dividends on outstanding unvested restricted stock units.

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586 + Details
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