Quarterly Results (Unaudited) Quarterly Results Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Results [Line Items]
Effect of Fourth Quarter Events, Amount	$ 13,300
Warranty Expense													$ 45,984	$ 9,238	$ 16,910
Costs incurred (released) and charged to expense		$ 587	$ (4,234)	$ (5,181)		$ 57	$ (8,657)	$ 6,383	$ (9,415)	$ (2,274)	$ (8,828)	$ (2,217)	(7,263)	49,482	$ 36,347
2014 Project [Member]
Quarterly Results [Line Items]
Costs incurred (released) and charged to expense					$ 54,400								(7,263)	54,445
Water Operating Segment [Member]
Quarterly Results [Line Items]
Warranty Expense			$ 23,600
Water Operating Segment [Member] | 2014 Project [Member]
Quarterly Results [Line Items]
Costs incurred (released) and charged to expense													$ 778	$ 1,162