Accrued Product Warranties Accrued Product Warrenties (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	Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Accrued product warranties, beginning of period	$ 16,712	$ 16,652	$ 17,732	$ 16,152
Amounts paid for warranty services	(2,076)	(1,754)	(4,763)	(4,146)
Warranty provisions for products sold	1,322	1,835	3,292	4,541
Currency translation adjustments and other	31	58	(272)	244
Accrued product warranties, end of period	15,989	16,791	15,989	16,791
Current accrued product warranties, end of period	13,222	13,638	13,222	13,638	14,665
Long-term accrued product warranties, end of period	$ 2,767	$ 3,153	$ 2,767	$ 3,153