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Allowance for Doubtful Accounts, Sales Returns and Discounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Balance at beginning of year $ 15,186 $ 15,186 $ 16,727
Charges (credits) to earnings 173 0 (1,541)
Amounts utilized 0 0 0
Balance at end of year $ 15,359 $ 15,186 $ 15,186