Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Allowance for doubtful accounts
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period		$ 2,731	[1]	$ 846	[1]	$ 955
Charged to Costs and Expenses		18		2,035		(5)
Charged to Other Accounts		0		0		0
Deductions	[2]	345		150		104
Balance at End of Period	[1]	2,404		2,731		846
Allowance for discounts, adjustments and returns
Valuation allowances and reserves [Roll Forward]
Balance at Beginning of Period		15,048	[1]	12,859	[1]	15,194
Charged to Costs and Expenses		25,150		23,629		20,476
Charged to Other Accounts		1,587		0		60
Deductions	[3]	24,388		21,440		22,871
Balance at End of Period	[1]	$ 17,397		$ 15,048		$ 12,859

[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.