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Allowance for Doubtful Accounts, Sales Returns and Discounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance at beginning of year $ 727 $ 15,359 $ 15,186
Charges to earnings 310 554 173
Amounts utilized (262) (15,186) 0
Balance at end of year $ 775 $ 727 $ 15,359