Balance Sheet Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts, Premiums and Other Receivables	$ 1,900	$ 1,760
Allowance for Doubtful Other Receivables, Current	$ 1,269	$ 1,400
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	350,000,000	350,000,000
Common Stock, Shares, Issued	148,689,623	148,364,037
Common Stock, Shares, Outstanding	148,689,623	148,364,037
Series C Preferred Stock [Member]
Preferred Stock, Shares Outstanding	460,000	460,000
Series D Preferred Stock [Member]
Preferred Stock, Shares Outstanding	1,815,000	1,815,000