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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowances $ 49,176 $ 48,138
Accumulated depreciation $ 92,643 $ 88,603
Series A preferred shares authorized (shares) 1,000,000 1,000,000
Series A preferred shares outstanding (shares) 200,000 200,000
Series A preferred shares, liquidation preference $ 203,000 $ 203,000
Preferred shares, par value (in dollars per share) $ 0.001 $ 0.001
Preferred shares authorized (shares) 4,000,000 4,000,000
Preferred shares outstanding (shares) 0 0
Common shares, par value (in dollars per share) $ 0.001 $ 0.001
Common shares issued (shares) 94,400,000 93,900,000
Common shares outstanding (shares) 74,100,000 73,600,000
Treasury stock (shares) 20,300,000 20,300,000