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Financial Statement Schedule I (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements    
Accounts receivable trade, allowance $ 28,156 $ 31,817
Common share, par value (in dollars per share) $ 0 $ 0
Common shares, shares issued (in shares) 55,965,443 55,161,856
Common shares, shares outstanding (in shares) 55,965,443 55,161,856
Parent Company    
Condensed Financial Statements    
Accounts receivable trade, allowance $ 3,852 $ 4,302
Common share, par value (in dollars per share) $ 0 $ 0
Common shares, shares issued (in shares) 55,965,443 55,161,856
Common shares, shares outstanding (in shares) 55,965,443 55,161,856