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Condensed Consolidated Balance Sheets Parenthetical (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Allowance for receivables $ 12,400,000 $ 13,300,000
Preferred Stock, Shares Authorized 2,357,299 2,357,299
Preferred Stock, 6 3/4% Cumulative Convertible, Shares Issued 155,250 155,250
Preferred Stock, 6 3/4% Cumulative Convertible, Shares Outstanding 155,250 155,250
Preferred Stock, Depositary Shares 3,105,000 3,105,000
Preferred Stock, Dividend Rate, Percentage 6.75% 6.75%
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000
Preferred Stock Liquidation Depositary Per Share $ 50 $ 50
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 480,000,000 480,000,000
Common Stock, Shares, Issued 208,450,336 202,960,430
Common Stock, Shares, Outstanding 207,928,616 202,468,710