Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Receivables:
Allowance for doubtful accounts, premiums and other receivables	$ 1,970	$ 3,167
Shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares issued	148,361,580	147,923,707
Common stock, shares outstanding	148,361,580	147,923,707
Series C Preferred Stock [Member]
Shareholders' equity:
Preferred stock, shares outstanding (in shares)	460,000	460,000
Series D Preferred Stock [Member]
Shareholders' equity:
Preferred stock, shares outstanding (in shares)	1,815,000	1,815,000