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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 Bad Debts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 1,239 $ 1,384 $ 1,203
Charged to costs and expenses 493 517 421
Deductions (396) (662) (240)
Balance at end of period 1,336 1,239 1,384
Sales Returns and Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 3,081 3,098 3,609
Charged to costs and expenses 521 252 398
Deductions (185) (269) (909)
Balance at end of period 3,417 3,081 3,098
Deferred Tax Asset Valuation Allowance [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 293 0 0
Charged to costs and expenses 0 293 0
Deductions (169) 0 0
Balance at end of period $ 124 $ 293 $ 0