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, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accrued Liabilities, Current [Abstract]      
Balance at beginning of period $ 10,452 $ 10,256 $ 12,112
Provision for warranty claims 4,905 4,758 1,371
Warranty claims (5,272) (4,468) (3,104)
Other 124 (94) (123)
Balance at end of period $ 10,209 $ 10,452 $ 10,256