Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		$ 3,634	$ 3,420	$ 3,889
Charged to Expense		3,626	3,586	3,917
Charged to Other Accounts	[1]	0	457	9
Deductions	[2]	1,099	3,829	4,395
Balance at End of Period		6,161	3,634	3,420
Allowance for returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		896	1,225	1,994
Charged to Expense		0	0	0
Charged to Other Accounts	[3]	5,307	1,561	4,890
Deductions	[4]	2,807	1,890	5,659
Balance at End of Period		3,396	896	1,225
Valuation allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period		85,400	76,789	14,156
Charged to Expense		0	0	0
Charged to Other Accounts	[5]	42,988	8,611	62,633
Deductions		0	0	0
Balance at End of Period		$ 128,388	$ 85,400	$ 76,789

[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.