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Financial Statement Schedule I - BALANCE SHEETS Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements |  |
Accounts receivable trade, allowance | $ 26,119 | $ 28,156
Common share, par value (in dollars per share) | $ 0 | $ 0
Common shares, shares issued (in shares) | 57,830,149 | 55,965,443
Common shares, shares outstanding (in shares) | 57,830,149 | 55,965,443
Parent Company |  |
Condensed Financial Statements |  |
Accounts receivable trade, allowance | $ 3,007 | $ 3,852
Advances to suppliers, allowance for doubtful | $ 5,225 | $ 5,225
Common share, par value (in dollars per share) | $ 0 | $ 0
Common shares, shares issued (in shares) | 57,830,149 | 55,965,443
Common shares, shares outstanding (in shares) | 57,830,149 | 55,965,443

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