XML 104 R89.htm IDEA: XBRL DOCUMENT v3.10.0.1
Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation $ 33,300 $ 38,100 $ 41,200
Summary of Property, plant and equipment      
Property, plant, and equipment 898,251 891,789  
Less allowances for depreciation, depletion, and amortization (647,233) (636,211)  
Property, plant, and equipment — net 251,018 255,578 $ 252,631
Land      
Summary of Property, plant and equipment      
Property, plant, and equipment 4,874 4,874  
Buildings      
Summary of Property, plant and equipment      
Property, plant, and equipment 149,701 137,196  
Machinery and equipment      
Summary of Property, plant and equipment      
Property, plant, and equipment 631,421 626,186  
Software      
Summary of Property, plant and equipment      
Property, plant, and equipment 42,678 40,575  
Construction in progress      
Summary of Property, plant and equipment      
Property, plant, and equipment 14,468 29,963  
Land Building Machinery and Equipment      
Summary of Property, plant and equipment      
Less allowances for depreciation, depletion, and amortization (642,365) (615,134)  
Property, plant, and equipment — net 200,777 223,660  
Capital leases      
Summary of Property, plant and equipment      
Property, plant, and equipment 22,150 10,912  
Less allowances for depreciation, depletion, and amortization (2,412) (2,741)  
Property, plant, and equipment — net 19,738 8,171  
Mineral resources      
Summary of Property, plant and equipment      
Property, plant, and equipment 4,980 4,979  
Mine development      
Summary of Property, plant and equipment      
Property, plant, and equipment 27,979 37,103  
Productive land      
Summary of Property, plant and equipment      
Less allowances for depreciation, depletion, and amortization (2,456) (18,335)  
Property, plant, and equipment — net $ 30,503 $ 23,747