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Supplemental Guarantor Information (Statement Of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Net cash provided by (used in) operating activities $ 421,232 $ (159,966)
Cash flows from investing activities:    
Distributions from unconsolidated entities 2,696 4,388
Investments in unconsolidated entities (1,266) (3,749)
Net change in loans held for investment 736 449
Change in restricted cash related to letters of credit 26,096 (89,385)
Proceeds from the sale of fixed assets 4,705 9,449
Capital expenditures (10,597) (15,162)
Net cash provided by (used in) investing activities 22,370 (94,010)
Cash flows from financing activities:    
Financial Services borrowings (repayments) 103,000 0
Other borrowings (repayments) (92,493) (68,351)
Issuance of common stock 27,432 0
Stock repurchases (961) (2,021)
Intercompany activities, net 0 0
Net cash provided by (used in) financing activities 36,978 (70,372)
Net increase (decrease) in cash and equivalents 480,580 (324,348)
Cash and equivalents at beginning of period 1,083,071 1,483,390
Cash and equivalents at end of period 1,563,651 1,159,042
Parent Company [Member]
    
Net cash provided by (used in) operating activities (397,371) (22,639)
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 26,096 (89,385)
Proceeds from the sale of fixed assets 0 0
Capital expenditures 0 0
Net cash provided by (used in) investing activities 26,096 (89,385)
Cash flows from financing activities:    
Financial Services borrowings (repayments) 0  
Other borrowings (repayments) (96,393) (69,311)
Issuance of common stock 27,432  
Stock repurchases (961) (2,021)
Intercompany activities, net 465,471 286,384
Net cash provided by (used in) financing activities 395,549 215,052
Net increase (decrease) in cash and equivalents 24,274 103,028
Cash and equivalents at beginning of period 119,287 10,000
Cash and equivalents at end of period 143,561 113,028
Guarantor Subsidiaries [Member]
    
Net cash provided by (used in) operating activities 765,922 (141,572)
Cash flows from investing activities:    
Distributions from unconsolidated entities 2,696 4,388
Investments in unconsolidated entities (1,266) (3,749)
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 fixed assets 4,705 9,449
Capital expenditures (8,398) (12,133)
Net cash provided by (used in) investing activities (2,263) (2,045)
Cash flows from financing activities:    
Financial Services borrowings (repayments) 0  
Other borrowings (repayments) 3,900 960
Issuance of common stock 0  
Stock repurchases 0 0
Intercompany activities, net (305,997) (252,468)
Net cash provided by (used in) financing activities (302,097) (251,508)
Net increase (decrease) in cash and equivalents 461,562 (395,125)
Cash and equivalents at beginning of period 875,561 1,106,623
Cash and equivalents at end of period 1,337,123 711,498
Non-Guarantor Subsidiaries [Member]
    
Net cash provided by (used in) operating activities 52,681 4,245
Cash flows from investing activities:    
Distributions from unconsolidated entities 0 0
Investments in unconsolidated entities 0 0
Net change in loans held for investment 736 449
Change in restricted cash related to letters of credit 0 0
Proceeds from the sale of fixed assets 0 0
Capital expenditures (2,199) (3,029)
Net cash provided by (used in) investing activities (1,463) (2,580)
Cash flows from financing activities:    
Financial Services borrowings (repayments) 103,000  
Other borrowings (repayments) 0 0
Issuance of common stock 0  
Stock repurchases 0 0
Intercompany activities, net (159,474) (33,916)
Net cash provided by (used in) financing activities (56,474) (33,916)
Net increase (decrease) in cash and equivalents (5,256) (32,251)
Cash and equivalents at beginning of period 88,223 366,767
Cash and equivalents at end of period 82,967 334,516
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 fixed assets 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
Issuance of common stock 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