Commitments and Contingencies Warranty Account Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Warranty Activity [Line Items]
Beginning balance	$ 58,139	$ 42,549	$ 36,466	$ 45,146
New product warranties	1,760	2,278	4,767	4,992
Other changes/adjustments to warranties	2,363	2,632	30,088	3,686
Claims activity	(7,147)	(5,605)	(14,711)	(12,113)
Effect of change in exchange rates	(371)	(1,500)	(1,866)	(1,357)
Ending balance	54,744	40,354	54,744	40,354
Less: current portion of warranty	40,060	22,283	40,060	22,283
Long-term warranty	$ 14,684	$ 18,071	$ 14,684	$ 18,071