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Supplemental Guarantor Information (Statement Of Cash Flows) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net cash provided by (used in) operating activities $ 114,690,000 $ (49,641,000)
Cash flows from investing activities:    
Distributions from unconsolidated entities 0 1,021,000
Investments in unconsolidated entities (49,000) (1,968,000)
Net change in loans held for investment 293,000 255,000
Change in restricted cash related to letters of credit 11,938,000 (109,667,000)
Proceeds from the sale of fixed assets 4,475,000 2,441,000
Capital expenditures (3,758,000) (6,128,000)
Net cash provided by (used in) investing activities 12,899,000 (114,046,000)
Cash flows from financing activities:    
Net borrowings (repayments) of other borrowings 1,920,000 (13,312,000)
Intercompany activities, net 0 0
Stock repurchases (845,000) (969,000)
Net cash provided by (used in) financing activities 1,075,000 (14,281,000)
Net increase (decrease) in cash and equivalents 128,664,000 (177,968,000)
Cash and equivalents at beginning of period 1,083,071,000 1,483,390,000
Cash and equivalents at end of period 1,211,735,000 1,305,422,000
Parent Company [Member]
    
Net cash provided by (used in) operating activities (106,147,000) 4,542,000
Cash flows from investing activities:    
Distributions from unconsolidated entities   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 11,938,000 (109,667,000)
Proceeds from the sale of fixed assets 0 0
Capital expenditures 0 0
Net cash provided by (used in) investing activities 11,938,000 (109,667,000)
Cash flows from financing activities:    
Net borrowings (repayments) of other borrowings 0 (13,902,000)
Intercompany activities, net 105,054,000 202,578,000
Stock repurchases (845,000) (969,000)
Net cash provided by (used in) financing activities 104,209,000 187,707,000
Net increase (decrease) in cash and equivalents 10,000,000 82,582,000
Cash and equivalents at beginning of period 119,287,000 10,000,000
Cash and equivalents at end of period 129,287,000 92,582,000
Guarantor Subsidiaries [Member]
    
Net cash provided by (used in) operating activities 115,341,000 (73,387,000)
Cash flows from investing activities:    
Distributions from unconsolidated entities   1,021,000
Investments in unconsolidated entities (49,000) (1,968,000)
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 4,475,000 2,441,000
Capital expenditures (3,249,000) (5,097,000)
Net cash provided by (used in) investing activities 1,177,000 (3,603,000)
Cash flows from financing activities:    
Net borrowings (repayments) of other borrowings 1,920,000 590,000
Intercompany activities, net 4,733,000 (154,222,000)
Stock repurchases 0 0
Net cash provided by (used in) financing activities 6,653,000 (153,632,000)
Net increase (decrease) in cash and equivalents 123,171,000 (230,622,000)
Cash and equivalents at beginning of period 875,561,000 1,106,623,000
Cash and equivalents at end of period 998,732,000 876,001,000
Non-Guarantor Subsidiaries [Member]
    
Net cash provided by (used in) operating activities 105,496,000 19,204,000
Cash flows from investing activities:    
Distributions from unconsolidated entities   0
Investments in unconsolidated entities 0 0
Net change in loans held for investment 293,000 255,000
Change in restricted cash related to letters of credit 0 0
Proceeds from the sale of fixed assets 0 0
Capital expenditures (509,000) (1,031,000)
Net cash provided by (used in) investing activities (216,000) (776,000)
Cash flows from financing activities:    
Net borrowings (repayments) of other borrowings 0 0
Intercompany activities, net (109,787,000) (48,356,000)
Stock repurchases 0 0
Net cash provided by (used in) financing activities (109,787,000) (48,356,000)
Net increase (decrease) in cash and equivalents (4,507,000) (29,928,000)
Cash and equivalents at beginning of period 88,223,000 366,767,000
Cash and equivalents at end of period 83,716,000 336,839,000
Eliminating Entries [Member]
    
Net cash provided by (used in) operating activities 0 0
Cash flows from investing activities:    
Distributions from unconsolidated entities   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:    
Net borrowings (repayments) of other borrowings 0 0
Intercompany activities, net 0 0
Stock repurchases 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