Commitments and Contingencies Warranty Expense (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Warranty charge	$ 23,600	$ 3,100		$ 26,700
Total warranty expense	$ 24,923		$ (644)	$ 30,732	$ 2,680