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Basis Of Presentation And Significant Accounting Policies (Schedule Of The Company's Interests In Land Option Agreements) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Land under option agreement [Line Items]    
Deposits and pre-acquisition costs $ 76,934 $ 70,116
Remaining Purchase Price 962,351 923,392
Land, not owned, under option agreements 38,988 31,066
Consolidated VIE [Member]
   
Land under option agreement [Line Items]    
Deposits and pre-acquisition costs 8,452 5,216
Remaining Purchase Price 14,030 8,590
Land, not owned, under option agreements 15,649 8,590
Unconsolidated VIE [Member]
   
Land under option agreement [Line Items]    
Deposits and pre-acquisition costs 25,294 24,078
Remaining Purchase Price 370,865 360,495
Land, not owned, under option agreements 0 0
Other Land Option Agreements Member
   
Land under option agreement [Line Items]    
Deposits and pre-acquisition costs 43,188 40,822
Remaining Purchase Price 577,456 554,307
Land, not owned, under option agreements $ 23,339 $ 22,476