Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]    
Accumulated depreciation and amortization on property $ 208,929 $ 193,735
Allowance for doubtful accounts $ 2,810 $ 2,250
Common shares, par value $ 0.001 $ 0.001
Common shares, shares authorized 1,000,000,000 1,000,000,000
Common shares, shares outstanding 116,600,000 115,800,000