Annual report pursuant to Section 13 and 15(d)

Accrued Liabilities (Reconciliation of Product Warranties) (Details)

v2.4.1.9
Accrued Liabilities (Reconciliation of Product Warranties) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accrued Liabilities, Current [Abstract]      
Balance at beginning of period $ 10,768us-gaap_StandardProductWarrantyAccrual $ 10,209us-gaap_StandardProductWarrantyAccrual $ 10,452us-gaap_StandardProductWarrantyAccrual
Provision for warranty claims 4,675us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 5,644us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 4,905us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Warranty claims (3,906)us-gaap_StandardProductWarrantyAccrualPayments (5,054)us-gaap_StandardProductWarrantyAccrualPayments (5,272)us-gaap_StandardProductWarrantyAccrualPayments
Other (389)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease (31)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease 124us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease
Balance at end of period $ 11,148us-gaap_StandardProductWarrantyAccrual $ 10,768us-gaap_StandardProductWarrantyAccrual $ 10,209us-gaap_StandardProductWarrantyAccrual