Commitments and Contingencies Warranty Account Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Warranty Activity [Line Items]
Beginning balance	$ 46,024	$ 50,754	$ 45,146	$ 53,605
New product warranties	1,483	1,961	2,714	2,822
Other changes/adjustments to warranties	(1,039)	3,611	1,054	5,638
Claims activity	(3,877)	(5,289)	(6,508)	(10,388)
Effect of change in exchange rates	(42)	(405)	143	(1,045)
Ending balance	42,549	50,632	42,549	50,632
Less: current portion of warranty	23,689	24,709	23,689	24,709
Long-term warranty	$ 18,860	$ 25,923	$ 18,860	$ 25,923