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Summary of Significant Accounting Policies:Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,192,591 $ 1,169,640
Less accumulated depreciation (735,300) (708,184)
Property and equipment, net 457,291 461,456
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 154,318 151,718
Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 64,972 64,178
Mobile equipment, information technology, and office furniture [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 182,427 178,271
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 715,155 687,768
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 28,620 $ 40,606