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Condensed Consolidated Balance Sheets Parenthetical - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Allowance for receivables $ 9,500,000 $ 9,900,000
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 96,000,000 96,000,000
Common Stock, Shares, Issued 42,133,326 42,056,237
Common Stock, Shares, Outstanding 42,133,326 42,056,237