SCHEDULE I CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 2,318,600	$ 2,516,200	$ 2,225,100	$ 1,960,900	$ 2,013,800	$ 2,432,300	$ 2,072,300	$ 1,780,000	$ 9,020,807	$ 8,298,380	$ 7,562,534
Expenses:
Selling, general and administrative									945,784	745,278	664,512
Total expenses									8,570,262	7,974,110	7,577,170
Income (loss) before income taxes	(40,300)	368,900	158,700	(36,800)	92,800	295,700	94,600	(158,900)	450,545	324,270	(14,636)
Provision for taxes on income									(207,466)	(128,540)	(16,662)
Net income (loss)									243,079	195,730	(31,298)
Parent
Condensed Financial Statements, Captions [Line Items]
Revenues									0	0	0
Expenses:
Selling, general and administrative									204	161	70
Interest expense, net of interest income									52,103	49,464	46,888
Total expenses									52,307	49,625	46,958
Income (loss) before income taxes									(52,307)	(49,625)	(46,958)
Provision for taxes on income									19,607	15,306	16,660
Equity in losses of subsidiaries, net of tax									275,779	210,489	(18,383)
Net income (loss)									$ 243,079	$ 176,170	$ (48,681)