Transactions Between Entities Under Common Control - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands					9 Months Ended	12 Months Ended
	Jul. 01, 2020	Jan. 02, 2020	Jun. 28, 2019	Apr. 02, 2019	Sep. 30, 2020	Dec. 31, 2019
Transactions Between Entities Under Common Control [Line Items]
Cash and cash equivalents					$ 1,346	$ 9,053
Accounts receivable, net					11,228	0
Inventories					61,978	32,998
Prepaid expenses and other current assets					14,845	5,617
Property, Plant and Equipment, Net					1,061,870	751,780
Other long-term assets					11,734	4,504
Assets					1,403,651	994,818
Accounts payable					27,182	18,985
Accrued Liabilities and Other Liabilities					78,759	59,066
Finance lease obligations					14,306	7,538
Long-term operating lease liabilities					50,891	33,469
Operating Lease, Right-of-Use Asset					52,417	32,830
Total liabilities					1,101,259	762,242
Net assets contributed to Partnership	$ 67,820
Hamlet Drop-Down
Transactions Between Entities Under Common Control [Line Items]
Cash payment		$ 40,000	$ 50,000	$ 24,700
Net purchase price adjustment				300
Total consideration				165,000
Purchase price		$ 40,000	$ 50,000	$ 24,700
Issuance of common units (in units)				1,681,237
Issuance of common units (usd per unit)				$ 29.74
Common unit issuance				$ 50,000
Greenwood Drop-Down
Transactions Between Entities Under Common Control [Line Items]
Cash and cash equivalents	29
Accounts receivable, net	25
Inventories	5,165
Prepaid expenses and other current assets	21
Property, Plant and Equipment, Net	104,662
Intangible assets, net	845
Other long-term assets	71
Assets	118,668
Accounts payable	1,951
Accrued Liabilities and Other Liabilities	4,303
Interest Payable	366
Seller Note	36,880
Finance lease obligations	699
Long-term operating lease liabilities	6,649
Operating Lease, Right-of-Use Asset	7,850
Total liabilities	50,848
Revenue					596,505	682
Net income					$ (4,596)	$ (46,323)
Greenwood Drop-Down | Greenwood, SC
Transactions Between Entities Under Common Control [Line Items]
Cash payment	129,700
Net purchase price adjustment	2,300
Total consideration	132,000
Purchase price	$ 129,700