Commitments and Contingencies Extended Warranty (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Beginning balance	$ 139,500
Ending balance	114,300	$ 139,500
Less: current portion of unearned revenue for extended warranty	64,976	73,301
Extended Warranty [Member]
Beginning balance	33,654	34,138
Unearned revenue for new extended warranties	1,437	2,792
Unearned revenue recognized	(3,594)	(2,832)
Effect of change in exchange rates	52	(444)
Ending balance	31,549	33,654
Less: current portion of unearned revenue for extended warranty	4,226	3,565
Long-term unearned revenue for extended warranty within Other long-term obligations	$ 27,323	$ 30,089