Schedule II - 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]
Balance at Beginning of Year	$ 559	$ 566	$ 151
Charged to Cost and Expenses	232	239	410
Charged to Other Accounts	10	(54)	5
Acquisition	0	0	0
Deductions	(195)	(192)	0
Balance at End of Year	606	559	566
Allowance for sales returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,259	1,121	523
Charged to Cost and Expenses	(346)	969	598
Charged to Other Accounts	0	0	0
Acquisition	0	0	0
Deductions	(183)	(831)	0
Balance at End of Year	730	1,259	1,121
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	85,938	92,081	20,821
Charged to Cost and Expenses	8,722	0	0
Charged to Other Accounts	0	3,715	873
Acquisition	0	0	71,722
Deductions	0	(9,858)	(1,335)
Balance at End of Year	94,660	85,938	92,081
Self-insurance liabilities
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,011	1,289	428
Charged to Cost and Expenses	622	348	1,660
Charged to Other Accounts	0	0	0
Acquisition	0	0	0
Deductions	(276)	(626)	(799)
Balance at End of Year	$ 1,357	$ 1,011	$ 1,289