Commitments and Contingencies (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) transaction claim	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) transaction claim	Jun. 30, 2014 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2011 USD ($) transaction
Loss Contingencies [Line Items]
Letters of credit outstanding	$ 193,400		$ 193,400			$ 212,100
Surety bonds outstanding	$ 999,100		$ 999,100			1,000,000
Maximum product warranty in years			10 years
Pending claims | claim	1,000		1,000
Self-insurance liabilities	$ 700,133	$ 746,446	$ 700,133	$ 746,446	$ 720,767	$ 710,245	$ 664,411	$ 668,100
Incurred but not reported percentage of liability reserves	73.00%		73.00%			72.00%
Adjustment to self insurance reserves	$ (26,900)	$ 84,500	$ (26,900)	$ 84,500
Residential mortgage backed securities known
Loss Contingencies [Line Items]
Residential mortgage-backed securities transactions | transaction									2
Residential mortgage-backed securities principal sold in previous period									$ 162,000
Residential mortgage backed securities other
Loss Contingencies [Line Items]
Residential mortgage-backed securities transactions | transaction	6		6
Residential mortgage-backed securities principal sold in previous period	$ 116,000		$ 116,000