Quarterly report pursuant to Section 13 or 15(d)

Product Warranty (Reconciliation Of Product Warranties) (Details)

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Product Warranty (Reconciliation Of Product Warranties) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reconciliation of Product Warranty Accrual [Roll Forward]        
Balance at beginning of period $ 11,733 $ 10,873 $ 11,487 $ 11,148
Provision for warranty claims 895 860 2,438 2,325
Warranty claims (906) (847) (2,433) (2,233)
Other (69) 80 161 (274)
Balance at end of period $ 11,653 $ 10,966 $ 11,653 $ 10,966