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Summary of Significant Accounting Policies:Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,176,946 $ 1,169,640
Less accumulated depreciation (720,879) (708,184)
Property and equipment, net 456,067 461,456
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 47,099 47,099
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 152,076 151,718
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 64,310 64,178
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 178,102 178,271
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 686,442 687,768
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 48,917 $ 40,606