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Financial Statement Schedule I - BALANCE SHEETS Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements    
Accounts receivable trade, allowance $ 32,941 $ 26,119
Common share, par value (in dollars per share) $ 0 $ 0
Common shares, shares issued (in shares) 58,496,685 57,830,149
Common shares, shares outstanding (in shares) 58,496,685 57,830,149
Parent Company    
Condensed Financial Statements    
Accounts receivable trade, allowance $ 3,642 $ 3,007
Advances to suppliers, allowance for doubtful $ 5,222 $ 5,225
Common share, par value (in dollars per share) $ 0 $ 0
Common shares, shares issued (in shares) 58,496,685 57,830,149
Common shares, shares outstanding (in shares) 58,496,685 57,830,149