Commitments and Contingencies Warranty Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Total warranty expense	$ 4,130	$ 6,187	$ 5,893	$ 7,966