Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Aug. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 226,472		$ 226,472		$ 186,064
Accumulated depreciation and amortization	(27,748)		(27,748)		(23,832)
Total	198,724		198,724		162,232
Depreciation and amortization	2,500	$ 2,200	5,300	$ 4,400
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	52,577		52,577		49,079
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,455		15,455		14,849
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,398		4,398		4,599
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,804		1,804		1,772
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,437		1,437		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	596		596		189
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	90,003		90,003		$ 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