Guarantor Consolidating Financial Statements Current Period Guarantor Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 952,091	$ 572,297	$ 525,728	$ 194,554
Notes, Loans and Financing Receivable, Net	10,030,657	9,162,492
Restricted Cash and Investments	705,022	919,283
Restricted Cash and Cash Equivalents	115,396	136,556
Property, Plant and Equipment, Net	50,079	47,440
Property Subject to or Available for Operating Lease, Net	1,366,785	809,491
Deferred Tax Assets, Net	147,366	108,684
Goodwill	1,107,966	1,107,982
Intercompany Receivable	34,332	37,447
Other Assets	129,858	141,248
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Assets	14,639,552	13,042,920
Line of Credit Facility, Amount Outstanding	523,235	1,099,391
Securitized Debt Obligation Liability	8,626,823	6,937,841
Senior Notes	500,000	500,000
Convertible Senior Notes	500	500
Accounts Payable And Accrued Expenses	203,486	160,172
Deferred Revenue	56,608	24,987
Tax Payable	90,777	85,477
Intercompany Taxes Payable	478,161	300,306
Derivative Liabilities	2,732	11,208
Liabilities	10,482,322	9,119,882
Additional Paid in Capital, Common Stock	3,458,303	3,470,495
Accumulated Other Comprehensive Income (Loss), Net of Tax	(9,807)	(7,617)
Retained Earnings (Accumulated Deficit)	708,734	460,160
Stockholders' Equity Attributable to Parent	4,157,230	3,923,038
Liabilities and Equity	14,639,552	13,042,920
Parent Company [Member]
Guarantor [Line Items]
Property, Plant and Equipment, Net	220	220
Deferred Tax Assets, Net	93,442	28,572
Goodwill	1,094,923	1,094,923
Intercompany Receivable	34,332	35,975
Other Assets	9,339	7,880
Due from Affiliates	865,337	769,778
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	3,127,567	2,871,356
Assets	5,225,160	4,808,704
Senior Notes	500,000	500,000
Convertible Senior Notes	500	500
Accounts Payable And Accrued Expenses	4,708	4,975
Tax Payable	84,561	79,885
Intercompany Taxes Payable	478,161	300,306
Liabilities	1,067,930	885,666
Additional Paid in Capital, Common Stock	3,458,303	3,470,495
Accumulated Other Comprehensive Income (Loss), Net of Tax	(9,807)	(7,617)
Retained Earnings (Accumulated Deficit)	708,734	460,160
Stockholders' Equity Attributable to Parent	4,157,230	3,923,038
Liabilities and Equity	5,225,160	4,808,704
Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	893,163	500,556	497,541	185,004
Notes, Loans and Financing Receivable, Net	694,423	558,770
Property, Plant and Equipment, Net	4,196	3,567
Deferred Tax Assets, Net	33,283	49,792
Other Assets	20,786	50,304
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	1,276,040	3,166,458
Assets	2,921,891	4,329,447
Accounts Payable And Accrued Expenses	86,813	60,070
Tax Payable	4,814	4,882
Intercompany Taxes Payable
Derivative Liabilities	2,276	4,768
Due to Affiliate	2,007,556	3,697,315
Liabilities	2,101,459	3,767,035
Additional Paid in Capital, Common Stock	79,187	79,187
Retained Earnings (Accumulated Deficit)	741,245	483,225
Stockholders' Equity Attributable to Parent	820,432	562,412
Liabilities and Equity	2,921,891	4,329,447
Non-Guarantor Subsidiaries [Member]
Guarantor [Line Items]
Cash and Cash Equivalents, at Carrying Value	58,928	71,741	28,187	9,550
Notes, Loans and Financing Receivable, Net	9,336,234	8,603,722
Restricted Cash and Investments	705,022	919,283
Restricted Cash and Cash Equivalents	115,396	136,556
Property, Plant and Equipment, Net	45,663	43,653
Property Subject to or Available for Operating Lease, Net	1,366,785	809,491
Deferred Tax Assets, Net	20,641	30,320
Goodwill	13,043	13,059
Intercompany Receivable		1,472
Other Assets	99,733	83,064
Due from Affiliates	1,142,219	2,927,537
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Assets	12,903,664	13,639,898
Line of Credit Facility, Amount Outstanding	523,235	1,099,391
Securitized Debt Obligation Liability	8,626,823	6,937,841
Senior Notes
Convertible Senior Notes
Accounts Payable And Accrued Expenses	111,965	95,127
Deferred Revenue	56,608	24,987
Tax Payable	1,402	710
Intercompany Taxes Payable
Derivative Liabilities	456	6,440
Due to Affiliate
Liabilities	9,320,489	8,164,496
Common Stock, Value, Issued	535,169	517,037
Additional Paid in Capital, Common Stock	198,559	1,001,958
Accumulated Other Comprehensive Income (Loss), Net of Tax	(20,006)	(17,396)
Retained Earnings (Accumulated Deficit)	2,869,453	3,973,803
Stockholders' Equity Attributable to Parent	3,583,175	5,475,402
Liabilities and Equity	12,903,664	13,639,898
Consolidation, Eliminations [Member]
Guarantor [Line Items]
Due from Affiliates	(2,007,556)	(3,697,315)
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	(4,403,607)	(6,037,814)
Assets	(6,411,163)	(9,735,129)
Due to Affiliate	(2,007,556)	(3,697,315)
Liabilities	(2,007,556)	(3,697,315)
Common Stock, Value, Issued	(535,169)	(517,037)
Additional Paid in Capital, Common Stock	(277,746)	(1,081,145)
Accumulated Other Comprehensive Income (Loss), Net of Tax	20,006	17,396
Retained Earnings (Accumulated Deficit)	(3,610,698)	(4,457,028)
Stockholders' Equity Attributable to Parent	(4,403,607)	(6,037,814)
Liabilities and Equity	$ (6,411,163)	$ (9,735,129)