Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		$ 2,200
Balance at End of Period		1,400	$ 2,200
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		3,791	3,292		$ 3,883
Charged to Expense		5,664	2,861		1,046
Charged to Other Accounts	[1]	0	76		0
Deductions	[2]	3,174	2,438		1,637
Balance at End of Period		6,281	3,791		3,292
Allowance for returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		2,185	2,062		2,564
Charged to Expense		0	0		0
Charged to Other Accounts	[3]	3,276	5,049		4,473
Deductions	[4]	4,023	4,926		4,975
Balance at End of Period		1,438	2,185		2,062
Valuation allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		15,167	26,465		18,185
Charged to Expense		0	0		0
Charged to Other Accounts		1,506	(11,298)	[5]	8,280	[5]
Deductions		0	0		0
Balance at End of Period		$ 16,673	$ 15,167		$ 26,465

[1] Adjustments from acquisitions.

[2] Uncollectible accounts written off, net of recoveries.

[3] Charged against revenues.

[4] Credits issued for returns.

[5] Related to deferred tax assets on foreign tax credits, net operating loss carryforwards, and depreciation.