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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Bad Debts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 1,336 $ 1,239 $ 1,384
Charged to costs and expenses 983 493 517
Deductions (288) (396) (662)
Balance at end of period 2,031 1,336 1,239
Sales Returns and Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 3,417 3,081 3,098
Charged to costs and expenses 254 521 252
Deductions (315) (185) (269)
Balance at end of period 3,356 3,417 3,081
Deferred Tax Asset Valuation Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 124 293 0
Charged to costs and expenses 317 0 293
Deductions 0 (169) 0
Balance at end of period $ 441 $ 124 $ 293