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Business Description, Basis of Presentation and Significant Accounting Policies Summary of Significant Accounting Policies - Warranties (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at the beginning of year $ 338 $ 385
Warranty accruals/additions 374 433
Warranty usage (383) (480)
Balance at end of period $ 329