Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Cash Flows [Abstract]
Net Income (loss)	$ 59,073	$ 39,745	$ (60,764)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Provision for (recovery of) bad debts	595	(3,986)	3,720
Deferred tax (benefit) expense	(2,739)	22,322	(20,062)
Depreciation and amortization	27,474	27,316	28,450
Amortization of debt discount and issuance costs	3,366	3,968	2,991
Interest paid-in-kind	3,421	2,832	705
Equity-based compensation	4,809	799	0
Contingent consideration	26,441	640	(825)
Warranty provision	953	1,387	(95)
Provision for inventory obsolescence	1,225	1,742	3,098
Changes in operating assets and liabilities:
Accounts receivable	(23,038)	(40,708)	19,399
Inventories	28,340	(94,594)	(10,261)
Income tax receivables	(16,530)	9,941	(11)
Prepaid expenses and other	1,101	2,228	(3,010)
Accounts payable	(50,519)	105,481	6,497
Accrued expenses and other	10,913	(1,978)	11,058
Income tax payable	6,870	1,944	0
Deferred revenue	(178,960)	306,994	7,383
Contingent consideration	(25,000)	0	0
Net Cash (Used in) Provided by Operating Activities	(122,205)	386,073	(11,727)
Cash Flows from Investing Activities
Purchase of property, plant and equipment	(1,338)	(1,697)	(2,073)
Internal-use software modification costs	0	0	(4,357)
Net Cash Used in Investing Activities	(1,338)	(1,697)	(6,430)
Cash Flows from Financing Activities
Principal payments on term loan	(57,702)	(25,000)	(64,587)
Proceeds from term loan facility	575,000	0	0
Principal payments on term loan facility	(115,000)	0	0
Proceeds from (Payments on) revolving loan	(70)	(39,078)	30,465
Proceeds from related party loan	0	0	50,600
Payments on related party loans	(45,558)	0	(12,000)
Debt discount and financing costs	(36,011)	0	(3,615)
Payment of special distribution	(589,000)	0	0
Proceeds from issuance of Class A Common Stock, net of underwriting discount and commissions	145,532	0	0
Deferred offering costs	(6,464)	0	0
Capital contribution	0	133	50,000
Net Cash (Used in) provided by Financing Activities	(129,273)	(63,945)	50,863
Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash	(252,816)	320,431	32,706
Cash, Cash Equivalents and Restricted Cash, beginning of year	361,257	40,826	8,120
Cash, Cash Equivalents and Restricted Cash, end of year	108,441	361,257	40,826
Supplemental Cash Flow Information
Cash paid for interest	6,935	11,343	14,257
Cash paid for income taxes	$ 31,103	$ 443	$ 176