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SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
VALUATION AND QUALIFYING ACCOUNTS      
Balance at Beginning of Year $ 11,914 $ 10,232 $ 9,283
Additions Charged to Costs and Expenses 2,345 1,682 949
Deductions (139)    
Balance at End of Year 14,120 11,914 10,232
Allowance for inventory obsolescence      
VALUATION AND QUALIFYING ACCOUNTS      
Balance at Beginning of Year 11,588 10,138 9,189
Additions Charged to Costs and Expenses 2,345 1,450 949
Balance at End of Year 13,933 11,588 10,138
Allowance for doubtful accounts receivable      
VALUATION AND QUALIFYING ACCOUNTS      
Balance at Beginning of Year 326 94 94
Additions Charged to Costs and Expenses   232  
Deductions (139)    
Balance at End of Year $ 187 $ 326 $ 94