Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at December 31, 2010	$ 6,691,000	$ 4,910,000	$ 2,265,000
Additions	837,000	8,164,000	4,559,000
Deductions	(2,376,000)	(6,383,000)	(1,914,000)
Balance at December 31, 2011	5,152,000	6,691,000	4,910,000
Allowance for Loan and Lease Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at December 31, 2010	8,196,000	71,972,000	0
Additions	0	700,000	71,972,000
Deductions	0	(64,476,000)	0
Balance at December 31, 2011	$ 8,196,000	$ 8,196,000	$ 71,972,000