Commitments and Contingencies Warranty Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Warranty charge	$ 1,500		$ 28,200
Total warranty expense	$ 4,123	$ 4,910	$ 34,855	$ 8,678