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 Beginning of Period	$ 12,314		$ 15,289		$ 20,650
Charged to Cost and Expense	6,180		1,276		2,544
Charged to Other Accounts	0		0		0
Deductions	(1,129)	[1]	(4,251)	[1]	(7,905)	[1]
Balance at End of Period	17,365		12,314		15,289
Claim Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	28,197		26,286		27,997
Charged to Cost and Expense	25,204		25,343		36,833
Charged to Other Accounts	0		0		0
Deductions	(22,036)	[2]	(23,432)	[2]	(38,544)	[2]
Balance at End of Period	31,365		28,197		26,286
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	19,058		14,692		13,707
Charged to Cost and Expense	0		4,366		985
Charged to Other Accounts	12,156		0		0
Deductions	(1,825)		0		0
Balance at End of Period	$ 29,389		$ 19,058		$ 14,692

[1] Amount represents accounts written off, net of recoveries.

[2] Amount represents claim payments, net of recoveries.