Commitments and Contingencies (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended	24 Months Ended
	Sep. 30, 2014 claim	Sep. 30, 2014 claim	Dec. 31, 2007	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011 Residential mortgage backed securities known [Member] transaction	Sep. 30, 2014 Residential mortgage backed securities other [Member] transaction	Sep. 30, 2014 Letter of Credit [Member]	Dec. 31, 2013 Letter of Credit [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]
Loss Contingency, Pending Claims, Number	1,000	1,000
Residential Mortgage-backed Securities Transactions									2	6
Residential mortgage-backed securities principal sold in previous period									162,000,000	116,000,000
Letters of Credit Outstanding, Amount	205,800,000	205,800,000			183,100,000						10,300,000	58,700,000
Surety Bonds Outstanding	975,900,000	975,900,000			958,300,000
Maximum product warranty in years		10 years
Self-insurance liabilities	734,663,000	734,663,000		746,446,000	668,100,000	691,598,000	708,142,000	721,284,000
Incurred but not reported percentage of liability reserves	76.00%	76.00%
Adjustment to self insurance reserves	$ 0	$ 84,500,000