Commitments and Contingencies Extended Warranty (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Beginning balance			$ 76,600
Ending balance	$ 82,800		82,800
Less: current portion of unearned revenue for extended warranty	50,255		50,255		$ 43,436
Extended Warranty [Member]
Beginning balance	33,900	$ 33,590	34,138	$ 33,528
Unearned revenue for new extended warranties	820	1,002	1,425	1,850
Unearned revenue recognized	(664)	(735)	(1,313)	(1,404)
Effect of change in exchange rates	28	101	(166)	(16)
Ending balance	34,084	33,958	34,084	33,958
Less: current portion of unearned revenue for extended warranty	3,216	2,475	3,216	2,475
Deferred Revenue, Noncurrent	$ 30,868	$ 31,483	$ 30,868	$ 31,483