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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 3,304 | $ 1,879
Fixed assets, accumulated depreciation | $ 129,579 | $ 128,546
Preference shares, authorized (in shares) | 145,000 | 95,000
Preference shares, issued (in shares) | 145,000 | 95,000
Preference shares, outstanding (in shares) | 145,000 | 95,000

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