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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts receivable, allowances $ 563 $ 472
Property, plant and equipment, accumulated depreciation $ 330,390 $ 292,412
Preferred shares, par value (in dollars per share) $ 0.01 $ 0.01
Preferred shares, shares authorized 30,000,000 30,000,000
Preferred shares, shares issued 0 0
Class A common shares
   
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, shares authorized 240,000,000 240,000,000
Common shares, shares issued 103,604,245 102,897,311
Class B common shares
   
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, shares authorized 120,000,000 120,000,000
Common shares, shares issued 18,044,478 18,044,478
Reduction due to class B common shares owned by a subsidiary, shares 18,044,478 18,044,478