Commitments and Contingencies Warranty Account Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Warranty Activity [Line Items]
Beginning balance	$ 45,146	$ 53,605
New product warranties	1,231	861
Other changes/adjustments to warranties	2,093	2,027
Claims activity	(2,631)	(5,099)
Effect of change in exchange rates	185	(640)
Ending balance	46,024	50,754
Less: current portion of warranty	21,989	25,150
Long-term warranty	$ 24,035	$ 25,604