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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
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at beginning of period $ 2,286 $ 1,224 $ 2,938
Charged to Cost and Expenses 3,075 1,743 (191)
Deductions 2,018 681 1,523
Balance at end of period 3,343 2,286 1,224
Allowance for obsolete and slow moving inventory      
Valuation and qualifying accounts      
Balance at beginning of period 11,500 5,871 4,107
Charged to Cost and Expenses 4,286 8,896 3,904
Deductions 5,976 3,267 2,140
Balance at end of period 9,810 11,500 5,871
Allowance for deferred tax assets      
Valuation and qualifying accounts      
Balance at beginning of period 633 633 633
Charged to Cost and Expenses 0 0 0
Deductions 0 0 0
Balance at end of period $ 633 $ 633 $ 633