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Litigation (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Mar. 12, 2015	Aug. 31, 2011
Loss Contingencies [Line Items]
Potential liabilities related to litigation and environmental matters	$ 19,000,000	$ 19,500,000	$ 25,800,000
Litigation related to construction materials [Member]
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss					$ 3,700,000
Additional amount per day of potential penalties					$ 5,000
Litigation related to construction services [Member]
Loss Contingencies [Line Items]
Damage repair estimate				$ 21,000,000