Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Aug. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 193,821		$ 186,064
Accumulated depreciation and amortization	(26,018)		(23,832)
Total	167,803		162,232
Depreciation and amortization	2,400	$ 2,200
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	59,314		59,314
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	49,278		49,079
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,441		14,849
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,729		4,599
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,774		1,772
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,480		1,477
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	493		493
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	395		401
Buildings improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	192		189
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	60,725		$ 53,891
Heartland Pet Food Mfg.
Property, Plant and Equipment [Line Items]
Purchased industrial revenue bonds	$ 10,800
City of Joplin, MO
Property, Plant and Equipment [Line Items]
Principal amount of industrial revenue bonds				$ 83,300