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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts receivable      
Deducted from asset accounts:      
Balance at Beginning of Period $ 1,578 $ 1,421 $ 1,403
Charged to Costs and Expenses 692 664 127
Charged to Other Accounts-Describe 0 0 (12)
Deduction-Describe 1,073 507 97
Balance at End of Period 1,197 1,578 1,421
Inventory reserves and obsolescence      
Deducted from asset accounts:      
Balance at Beginning of Period 8,193 6,333 5,872
Charged to Costs and Expenses 3,842 6,067 5,250
Charged to Other Accounts-Describe 0 0 0
Deduction-Describe 4,166 4,207 4,789
Balance at End of Period $ 7,869 $ 8,193 $ 6,333