Warranties Changes in accrued product warranties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Product Warranties Disclosures [Abstract]
Product Warranty Accrual, Additions from Business Acquisition	$ 0	$ 26	$ 0	$ 19,710
Movement in Standard Product Warranty Accrual [Roll Forward]
Balances at beginning of period	31,247	37,590	36,121	22,067
Increases to accruals related to sales during the period	1,186	4,184	4,986	7,609
Warranty expenditures	(3,048)	(5,077)	(9,751)	(12,683)
Balances at end of period	29,337	34,249	29,337	34,249
Product Warranty Accrual, Foreign Exchange Impact	$ (48)	$ (2,474)	$ (2,019)	$ (2,454)