Cash Discounts And Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Cash Discounts [Roll Forward]
Beginning Balance, Allowance for Cash Discounts	$ 1,411	$ 1,498	$ 1,373
Provision (Charged to Expense), Allowance for Cash Discounts	22,943	21,228	20,440
Deductions, Allowance for Cash Discounts	(22,794)	(21,315)	(20,315)
Ending Balance, Allowance for Cash Discounts	1,560	1,411	1,498
Allowance for Doubtful Accounts
Beginning Balance, Allowance for Doubtful Accounts	5,457	6,266	5,926
Provision (Charged to Expense), Allowance for Doubtful Accounts	2,028	4,379	5,537
Deductions, Allowance for Doubtful Accounts	(2,208)	(5,188)	(5,197)
Ending Balance, Allowance for Doubtful Accounts	5,277	5,457	6,266
Allowance for Cash Discounts and Doubtful Accounts
Beginning Balance, Allowance for Cash Discounts and Doubtful Accounts, Total	6,868	7,764	7,299
Provision for Cash Discounts and Doubtful Accounts	24,971	25,607	25,977
Deductions, Allowance for Cash Discounts and Doubtful Accounts	(25,002)	(26,503)	(25,512)
Ending Balance, Allowance for Cash Discounts and Doubtful Accounts, Total	$ 6,837	$ 6,868	$ 7,764