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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts	$ 170	$ 132
Accumulated amortization	$ 156,870	$ 127,172
Preferred share, par value	$ 0.01	$ 0.01
Preferred share, shares authorized	50,000,000	50,000,000
Preferred share, shares issued	0	0
Preferred share, shares outstanding	0	0
Common share, par value	$ 0.01	$ 0.01
Common share, shares authorized	600,000,000	600,000,000
Common share, shares issued	157,353,191	152,979,479
Common share, shares outstanding	157,353,191	152,979,479

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Amount of allowance for credit loss on accounts receivable.

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Face amount or stated value per share of common stock.

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