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Supplemental Guarantor Information (Statement Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net cash provided by (used in) operating activities $ 270,620 $ 114,690
Cash flows from investing activities:    
Distributions from unconsolidated entities 200 0
Investments in unconsolidated entities (593) (49)
Net change in loans held for investment 10 293
Change in restricted cash related to letters of credit 4,513 11,938
Proceeds from the sale of property and equipment 59 4,475
Capital expenditures (5,378) (3,758)
Net cash provided by (used in) investing activities (1,189) 12,899
Cash flows from financing activities:    
Financial Services borrowings (repayments) (82,164) 0
Other borrowings (repayments) (213) 1,920
Stock option exercises 7,537 0
Stock repurchases (6,427) (845)
Intercompany activities, net 0 0
Net cash provided by (used in) financing activities (81,267) 1,075
Net increase (decrease) in cash and equivalents 188,164 128,664
Cash and equivalents at beginning of period 1,404,760 1,083,071
Cash and equivalents at end of period 1,592,924 1,211,735
Parent Company [Member]
    
Net cash provided by (used in) operating activities (146,577) (106,147)
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 4,513 11,938
Proceeds from the sale of property and equipment 0 0
Capital expenditures 0 0
Net cash provided by (used in) investing activities 4,513 11,938
Cash flows from financing activities:    
Financial Services borrowings (repayments) 0  
Other borrowings (repayments) 0 0
Stock option exercises 7,537  
Stock repurchases (6,427) (845)
Intercompany activities, net 185,543 105,054
Net cash provided by (used in) financing activities 186,653 104,209
Net increase (decrease) in cash and equivalents 44,589 10,000
Cash and equivalents at beginning of period 146,168 119,287
Cash and equivalents at end of period 190,757 129,287
Guarantor Subsidiaries [Member]
    
Net cash provided by (used in) operating activities 331,557 115,341
Cash flows from investing activities:    
Distributions from unconsolidated entities 200 0
Investments in unconsolidated entities (593) (49)
Net change in loans held for investment    0
Change in restricted cash related to letters of credit 0 0
Proceeds from the sale of property and equipment 59 4,475
Capital expenditures (4,921) (3,249)
Net cash provided by (used in) investing activities (5,255) 1,177
Cash flows from financing activities:    
Financial Services borrowings (repayments) 0  
Other borrowings (repayments) (213) 1,920
Stock option exercises 0  
Stock repurchases 0 0
Intercompany activities, net (73,913) 4,733
Net cash provided by (used in) financing activities (74,126) 6,653
Net increase (decrease) in cash and equivalents 252,176 123,171
Cash and equivalents at beginning of period 1,063,943 875,561
Cash and equivalents at end of period 1,316,119 998,732
Non-Guarantor Subsidiaries [Member]
    
Net cash provided by (used in) operating activities 85,640 105,496
Cash flows from investing activities:    
Distributions from unconsolidated entities 0 0
Investments in unconsolidated entities 0 0
Net change in loans held for investment 10 293
Change in restricted cash related to letters of credit 0 0
Proceeds from the sale of property and equipment 0 0
Capital expenditures (457) (509)
Net cash provided by (used in) investing activities (447) (216)
Cash flows from financing activities:    
Financial Services borrowings (repayments) (82,164)  
Other borrowings (repayments) 0 0
Stock option exercises 0  
Stock repurchases 0 0
Intercompany activities, net (111,630) (109,787)
Net cash provided by (used in) financing activities (193,794) (109,787)
Net increase (decrease) in cash and equivalents (108,601) (4,507)
Cash and equivalents at beginning of period 194,649 88,223
Cash and equivalents at end of period 86,048 83,716
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 0
Net cash provided by (used in) investing activities 0 0
Cash flows from financing activities:    
Financial Services borrowings (repayments) 0  
Other borrowings (repayments) 0 0
Stock option exercises 0  
Stock repurchases 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 0
Cash and equivalents at end of period $ 0 $ 0