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Summary of Significant Accounting Policies:Property and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,209,753 $ 1,169,640
Less accumulated depreciation (750,499) (708,184)
Property and equipment, net 459,254 461,456
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 154,984 151,718
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 65,570 64,178
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 185,053 178,271
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 721,713 687,768
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 35,334 $ 40,606