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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Statement Of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 8,490 | $ 8,405
Common shares, par value | $ 0.10 | $ 0.10
Common shares, authorized | 50,000,000 | 50,000,000
Common shares, issued | 18,485,788 | 18,278,833
Common shares, outstanding | 18,485,788 | 18,278,833

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