Supplemental Guarantor Information (Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net cash provided by (used in) operating activities	$ 201,835	$ 554,950
Cash flows from investing activities:
Distributions from unconsolidated entities	7,624	200
Investments in unconsolidated entities	(9)	(1,057)
Net change in loans held for investment	(6,338)	236
Change in restricted cash related to letters of credit	48,401	875
Proceeds from the sale of property and equipment	83	9
Capital expenditures	(41,888)	(18,354)
Cash used for business acquisitions	(77,469)	0
Net cash provided by (used in) investing activities	(69,596)	(18,091)
Cash flows from financing activities:
Financial Services borrowings (repayments)	(34,070)	(23,697)
Other borrowings (repayments)	(250,631)	(477,220)
Stock option exercises	6,034	18,549
Stock repurchases	(155,140)	(89,940)
Dividends paid	(56,944)	(19,317)
Intercompany activities, net	0	0
Net cash provided by (used in) financing activities	(490,751)	(591,625)
Net increase (decrease) in cash and equivalents	(358,512)	(54,766)
Cash and equivalents at beginning of period	1,580,329	1,404,760
Cash and equivalents at end of period	1,221,817	1,349,994
Parent Company [Member]
Net cash provided by (used in) operating activities	265,107	15,822
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	48,401	875
Proceeds from the sale of property and equipment	0	0
Capital expenditures	0	0
Cash used for business acquisitions	0
Net cash provided by (used in) investing activities	48,401	875
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Other borrowings (repayments)	(249,765)	(485,048)
Stock option exercises	6,034	18,549
Stock repurchases	(155,140)	(89,940)
Dividends paid	(56,944)	(19,317)
Intercompany activities, net	(119,195)	600,190
Net cash provided by (used in) financing activities	(575,010)	24,434
Net increase (decrease) in cash and equivalents	(261,502)	41,131
Cash and equivalents at beginning of period	262,364	146,168
Cash and equivalents at end of period	862	187,299
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	(73,268)	511,801
Cash flows from investing activities:
Distributions from unconsolidated entities	7,627	200
Investments in unconsolidated entities	0	(1,057)
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	83	9
Capital expenditures	(39,025)	(16,679)
Cash used for business acquisitions	(77,469)
Net cash provided by (used in) investing activities	(108,784)	(17,527)
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Other borrowings (repayments)	(866)	7,828
Stock option exercises	0	0
Stock repurchases	0	0
Dividends paid	0	0
Intercompany activities, net	163,409	(485,052)
Net cash provided by (used in) financing activities	162,543	(477,224)
Net increase (decrease) in cash and equivalents	(19,509)	17,050
Cash and equivalents at beginning of period	1,188,999	1,063,943
Cash and equivalents at end of period	1,169,490	1,080,993
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	9,996	27,327
Cash flows from investing activities:
Distributions from unconsolidated entities	(3)	0
Investments in unconsolidated entities	(9)	0
Net change in loans held for investment	(6,338)	236
Change in restricted cash related to letters of credit	0	0
Proceeds from the sale of property and equipment	0	0
Capital expenditures	(2,863)	(1,675)
Cash used for business acquisitions	0
Net cash provided by (used in) investing activities	(9,213)	(1,439)
Cash flows from financing activities:
Financial Services borrowings (repayments)	(34,070)	(23,697)
Other borrowings (repayments)	0	0
Stock option exercises	0	0
Stock repurchases	0	0
Dividends paid	0	0
Intercompany activities, net	(44,214)	(115,138)
Net cash provided by (used in) financing activities	(78,284)	(138,835)
Net increase (decrease) in cash and equivalents	(77,501)	(112,947)
Cash and equivalents at beginning of period	128,966	194,649
Cash and equivalents at end of period	51,465	81,702
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
Cash used for business acquisitions	0
Net cash provided by (used in) investing activities	0	0
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Other borrowings (repayments)	0	0
Stock option exercises	0	0
Stock repurchases	0	0
Dividends paid	0	0
Intercompany activities, net	0	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