Supplemental Guarantor Information (Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net cash provided by (used in) operating activities	$ 881,136	$ 760,140	$ 17,279
Cash flows from investing activities:
Distributions from unconsolidated entities	1,001	3,029	4,531
Investments in unconsolidated entities	(1,677)	(16,456)	(4,603)
Net change in loans held for investment	(12,265)	836	325
Change in restricted cash related to letters of credit	(4,152)	28,653	(83,199)
Proceeds from the sale of property and equipment	15	7,586	10,555
Capital expenditures	(28,899)	(13,942)	(21,238)
Net cash provided by (used in) investing activities	(45,977)	9,706	(93,629)
Cash flows from financing activities:
Financial Services borrowings (repayments)	(33,131)	138,795	0
Other borrowings (repayments)	(479,827)	(618,800)	(321,133)
Stock option exercises	19,411	32,809	0
Stock repurchases	(127,661)	(961)	(2,836)
Dividends paid	(38,382)	0	0
Intercompany activities, net	0	0	0
Net cash provided by (used in) financing activities	(659,590)	(448,157)	(323,969)
Net increase (decrease) in cash and equivalents	175,569	321,689	(400,319)
Cash and equivalents at beginning of period	1,404,760	1,083,071	1,483,390
Cash and equivalents at end of period	1,580,329	1,404,760	1,083,071
Parent Company [Member]
Net cash provided by (used in) operating activities	(41)	(582,762)	(86,000)
Cash flows from investing activities:
Distributions from unconsolidated entities	0	0	0
Investments in unconsolidated entities	0	0	0
Net change in loans held for investment	0	0	0
Change in restricted cash related to letters of credit	(4,152)	28,653	(83,199)
Proceeds from the sale of property and equipment	0	0	0
Capital expenditures	0	0	0
Net cash provided by (used in) investing activities	(4,152)	28,653	(83,199)
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Other borrowings (repayments)	(485,048)	(620,700)	(320,973)
Stock option exercises	19,411	32,809
Stock repurchases	(127,661)	(961)	(2,836)
Dividends paid	(38,382)
Intercompany activities, net	752,069	1,169,842	602,295
Net cash provided by (used in) financing activities	120,389	580,990	278,486
Net increase (decrease) in cash and equivalents	116,196	26,881	109,287
Cash and equivalents at beginning of period	146,168	119,287	10,000
Cash and equivalents at end of period	262,364	146,168	119,287
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	865,267	1,332,342	520,024
Cash flows from investing activities:
Distributions from unconsolidated entities	1,001	3,029	4,531
Investments in unconsolidated entities	(1,677)	(16,456)	(4,603)
Net change in loans held for investment	0	0	0
Change in restricted cash related to letters of credit	0	0	0
Proceeds from the sale of property and equipment	15	7,586	10,555
Capital expenditures	(26,472)	(10,831)	(18,331)
Net cash provided by (used in) investing activities	(27,133)	(16,672)	(7,848)
Cash flows from financing activities:
Financial Services borrowings (repayments)	0	0
Other borrowings (repayments)	5,221	1,900	(160)
Stock option exercises	0	0
Stock repurchases	0	0	0
Dividends paid	0
Intercompany activities, net	(718,299)	(1,129,188)	(743,078)
Net cash provided by (used in) financing activities	(713,078)	(1,127,288)	(743,238)
Net increase (decrease) in cash and equivalents	125,056	188,382	(231,062)
Cash and equivalents at beginning of period	1,063,943	875,561	1,106,623
Cash and equivalents at end of period	1,188,999	1,063,943	875,561
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	15,910	10,560	(416,745)
Cash flows from investing activities:
Distributions from unconsolidated entities	0	0	0
Investments in unconsolidated entities	0	0	0
Net change in loans held for investment	(12,265)	836	325
Change in restricted cash related to letters of credit	0	0	0
Proceeds from the sale of property and equipment	0	0	0
Capital expenditures	(2,427)	(3,111)	(2,907)
Net cash provided by (used in) investing activities	(14,692)	(2,275)	(2,582)
Cash flows from financing activities:
Financial Services borrowings (repayments)	(33,131)	138,795
Other borrowings (repayments)		0	0
Stock option exercises	0	0
Stock repurchases	0	0	0
Dividends paid	0
Intercompany activities, net	(33,770)	(40,654)	140,783
Net cash provided by (used in) financing activities	(66,901)	98,141	140,783
Net increase (decrease) in cash and equivalents	(65,683)	106,426	(278,544)
Cash and equivalents at beginning of period	194,649	88,223	366,767
Cash and equivalents at end of period	128,966	194,649	88,223
Eliminating Entries [Member]
Net cash provided by (used in) operating activities	0	0	0
Cash flows from investing activities:
Distributions from unconsolidated entities	0	0	0
Investments in unconsolidated entities	0	0	0
Net change in loans held for investment	0	0	0
Change in restricted cash related to letters of credit	0	0	0
Proceeds from the sale of property and equipment	0	0	0
Capital expenditures	0	0	0
Net cash provided by (used in) investing activities	0	0	0
Cash flows from financing activities:
Financial Services borrowings (repayments)		0
Other borrowings (repayments)		0	0
Stock option exercises	0	0
Stock repurchases	0	0	0
Dividends paid	0
Intercompany activities, net	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Net increase (decrease) in cash and equivalents	0	0	0
Cash and equivalents at beginning of period	0	0	0
Cash and equivalents at end of period	$ 0	$ 0	$ 0