Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Aug. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 272,913		$ 272,913		$ 186,064
Accumulated depreciation and amortization	(30,211)		(30,211)		(23,832)
Total	242,702		242,702		162,232
Depreciation and amortization	2,500	$ 2,300	7,800	$ 6,800
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	59,314		59,314		59,314
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	53,959		53,959		49,079
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,875		16,875		14,849
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,582		4,582		4,599
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,840		1,840		1,772
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,589		1,589		1,477
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	493		493		493
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	395		395		401
Buildings improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	600		600		189
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	133,266		133,266		$ 53,891
Heartland Pet Food Mfg.
Property, Plant and Equipment [Line Items]
Purchased industrial revenue bonds	$ 10,800		$ 10,800
City of Joplin, MO
Property, Plant and Equipment [Line Items]
Principal amount of industrial revenue bonds						$ 83,300