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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts, accounts receivable	$ 1,371	$ 10,085
Preferred shares, par value	$ 0.10	$ 0.10
Preferred shares, shares authorized	5,000,000	5,000,000
Preferred shares, issued	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	145,000,000	145,000,000
Common stock, issued	36,295,000	36,957,000
Common stock, outstanding	36,295,000	36,957,000

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Amount of allowance for credit loss on accounts receivable, classified as current.

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