Supplemental Guarantor Information (Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Net cash provided by (used in) operating activities	$ 74,282	$ 335,065
Cash flows from investing activities:
Distributions from unconsolidated entities	7,577	200
Investments in unconsolidated entities	(9)	(807)
Net change in loans held for investment	(6,791)	18
Change in restricted cash related to letters of credit	(28,166)	4,222
Proceeds from the sale of property and equipment	98	9
Capital expenditures	(33,021)	(11,017)
Net cash provided by (used in) investing activities	(60,312)	(7,375)
Cash flows from financing activities:
Financial Services borrowings (repayments)	(47,158)	(78,929)
Proceeds from (Repayments of) Debt	(240,133)	(452,950)
Stock option exercises	5,789	18,544
Stock repurchases	(103,711)	(6,447)
Dividends paid	(38,152)	0
Intercompany activities, net	0	0
Net cash provided by (used in) financing activities	(423,365)	(519,782)
Net increase (decrease) in cash and equivalents	(409,395)	(192,092)
Cash and equivalents at beginning of period	1,580,329	1,404,760
Cash and equivalents at end of period	1,170,934	1,212,668
Parent Company [Member]
Net cash provided by (used in) operating activities	59,307	(167,506)
Cash flows from investing activities:
Distributions from unconsolidated entities	0	0
Investments in unconsolidated entities	0	0
Net change in loans held for investment	0	0
Change in restricted cash related to letters of credit	(28,166)	4,222
Proceeds from the sale of property and equipment	0	0
Capital expenditures	0	0
Net cash provided by (used in) investing activities	(28,166)	4,222
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Proceeds from (Repayments of) Debt	(249,765)	(454,335)
Stock option exercises	5,789	18,544
Stock repurchases	(103,711)	(6,447)
Dividends paid	(38,152)
Intercompany activities, net	321,771	650,741
Net cash provided by (used in) financing activities	(64,068)	208,503
Net increase (decrease) in cash and equivalents	(32,927)	45,219
Cash and equivalents at beginning of period	262,364	146,168
Cash and equivalents at end of period	229,437	191,387
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	(19,311)	429,101
Cash flows from investing activities:
Distributions from unconsolidated entities	7,577	200
Investments in unconsolidated entities	0	(807)
Net change in loans held for investment	0	0
Change in restricted cash related to letters of credit	0	0
Proceeds from the sale of property and equipment	98	9
Capital expenditures	(30,908)	(10,029)
Net cash provided by (used in) investing activities	(23,233)	(10,627)
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Proceeds from (Repayments of) Debt	9,632	1,385
Stock option exercises	0	0
Stock repurchases	0	0
Dividends paid	0
Intercompany activities, net	(272,939)	(547,848)
Net cash provided by (used in) financing activities	(263,307)	(546,463)
Net increase (decrease) in cash and equivalents	(305,851)	(127,989)
Cash and equivalents at beginning of period	1,188,999	1,063,943
Cash and equivalents at end of period	883,148	935,954
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	34,286	73,470
Cash flows from investing activities:
Distributions from unconsolidated entities	0	0
Investments in unconsolidated entities	(9)	0
Net change in loans held for investment	(6,791)	18
Change in restricted cash related to letters of credit	0	0
Proceeds from the sale of property and equipment	0	0
Capital expenditures	(2,113)	(988)
Net cash provided by (used in) investing activities	(8,913)	(970)
Cash flows from financing activities:
Financial Services borrowings (repayments)	(47,158)	(78,929)
Proceeds from (Repayments of) Debt	0	0
Stock option exercises	0	0
Stock repurchases	0	0
Dividends paid	0
Intercompany activities, net	(48,832)	(102,893)
Net cash provided by (used in) financing activities	(95,990)	(181,822)
Net increase (decrease) in cash and equivalents	(70,617)	(109,322)
Cash and equivalents at beginning of period	128,966	194,649
Cash and equivalents at end of period	58,349	85,327
Eliminating Entries [Member]
Net cash provided by (used in) operating activities	0	0
Cash flows from investing activities:
Distributions from unconsolidated entities	0	0
Investments in unconsolidated entities	0	0
Net change in loans held for investment	0	0
Change in restricted cash related to letters of credit	0	0
Proceeds from the sale of property and equipment	0	0
Capital expenditures		0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Proceeds from (Repayments of) Debt	0	0
Stock option exercises	0	0
Stock repurchases	0	0
Dividends paid	0
Intercompany activities, net		0
Net cash provided by (used in) financing activities	0	0
Net increase (decrease) in cash and equivalents	0	0
Cash and equivalents at beginning of period	0
Cash and equivalents at end of period	$ 0	$ 0