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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 4,498 | $ 5,473
Fixed assets, accumulated depreciation | $ 137,729 | $ 136,166
Preference shares, authorized (in shares) | 145,000 | 145,000
Preference shares, issued (in shares) | 145,000 | 145,000
Preference shares, outstanding (in shares) | 145,000 | 145,000

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