Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Reconciliation of Product Warranties) (Details)

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Accrued Liabilities (Reconciliation of Product Warranties) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accrued Liabilities, Current [Abstract]      
Balance at beginning of period $ 11,148 $ 10,768 $ 10,209
Provision for warranty claims 4,560 4,675 5,644
Warranty claims (3,708) (3,906) (5,054)
Other (513) (389) (31)
Balance at end of period $ 11,487 $ 11,148 $ 10,768