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Commitments and Contingencies (Narrative) (Details) (USD $)
 3 Months Ended 24 Months Ended
Mar. 31, 2014
Dec. 31, 2007
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Residential mortgage backed securities known [Member]
Mar. 31, 2014
Residential mortgage backed securities other [Member]
Commitments and Contingencies Disclosure [Abstract]              
Total Mortgage Loans Originated   $ 39,500,000,000          
Percentage of loan origination repurchase requests in which Company is able to cure or refute the claim 60.00%            
Actual Loss Severities Percentage on Mortgage Repurchase Requests 50.00%            
Loss Contingency Accrual, Period Increase (Decrease) 18,600,000            
Loss Contingencies [Line Items]              
Residential mortgage-backed securities principal sold in previous period           162,000,000 116,000,000
Letters of Credit Outstanding, Amount 161,800,000   183,100,000        
Surety Bonds Outstanding 960,700,000   958,300,000        
Maximum product warranty in years 10 years            
Number of self-insurance claims managed at any one time 1,000            
Self-insurance liabilities $ 664,411,000   $ 668,100,000 $ 717,024,000 $ 721,284,000    
Incurred but not reported percentage of liability reserves 78.00%