Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for doubtful accounts
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	$ 846	[1]	$ 955	[1]	$ 949
Charged to Costs and Expenses	2,035		(5)		46
Charged to Other Accounts	0		0		7
Deductions	150	[2]	104	[2]	47	[2]
Balance at End of Period	2,731	[1]	846	[1]	955	[1]
Allowance for discounts, adjustments and returns
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period	12,859	[1]	15,194	[1]	13,296
Charged to Costs and Expenses	23,629		20,476		19,897
Charged to Other Accounts	0		60		379
Deductions	21,440	[3]	22,871	[3]	18,378	[3]
Balance at End of Period	$ 15,048	[1]	$ 12,859	[1]	$ 15,194	[1]

[1] Balances which are not required to be presented and those which are immaterial have been omitted.

[2] Write-offs, net of recoveries.

[3] Payments and customer deductions for product returns, discounts and allowances.