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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Nov. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Property, Plant and Equipment        
Assets held-for-sale   $ 9,251 $ 0 $ 0
Property, plant and equipment, gross   561,281 550,922 530,788
Less accumulated depreciation and amortization   (316,768) (299,907) (297,321)
Property, plant and equipment excluding capital projects in progress, net   244,513 251,015 233,467
Capital projects in progress   13,166 22,005 31,711
Property, plant and equipment, net   257,679 273,020 265,178
Forecast        
Property, Plant and Equipment        
Proceeds from Sale of Property Held-for-sale $ 18,000      
Vacaville Property Held for Sale [Member]        
Property, Plant and Equipment        
Assets held-for-sale   8,600    
Land        
Property, Plant and Equipment        
Property, plant and equipment, gross   30,173 33,087 33,030
Buildings and site improvements        
Property, Plant and Equipment        
Property, plant and equipment, gross   203,323 212,817 201,877
Leasehold improvements        
Property, Plant and Equipment        
Property, plant and equipment, gross   4,694 4,684 5,911
Machinery, equipment, and software        
Property, Plant and Equipment        
Property, plant and equipment, gross   $ 323,091 $ 300,334 $ 289,970