Commitments and Contingencies Warranty Account Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Warranty Activity [Line Items]
Beginning balance	$ 37,065	$ 46,024	$ 36,466	$ 45,146
New product warranties	1,207	1,483	3,007	2,714
Other changes/adjustments to warranties	23,716	(1,039)	27,725	1,054
Claims activity	(4,283)	(3,877)	(7,564)	(6,508)
Effect of change in exchange rates	434	(42)	(1,495)	143
Ending balance	58,139	42,549	58,139	42,549
Less: current portion of warranty	35,589	23,689	35,589	23,689
Long-term warranty	$ 22,550	$ 18,860	$ 22,550	$ 18,860