Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 17,365		$ 12,314		$ 15,289
Charged to Costs & Expenses	15,412		6,180		1,276
Charged to Other Accounts	0		0		0
Deductions	11,132	[1]	1,129	[1]	4,251	[1]
Balance at End of Period	21,645		17,365		12,314
Claim Losses [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	31,365		28,197		26,286
Charged to Costs & Expenses	20,813		25,204		25,343
Charged to Other Accounts	0		0		0
Deductions	16,190	[2]	22,036	[2]	23,432	[2]
Balance at End of Period	35,988		31,365		28,197
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	29,389		19,058		14,692
Charged to Costs & Expenses	13,134		0		4,366
Charged to Other Accounts	(11,568)	[3]	12,156	[3]	0
Deductions	0		1,825		0
Balance at End of Period	$ 30,955		$ 29,389		$ 19,058

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

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

[3] Amount represents adjustments for acquired net operating loss and credit carryforwards.