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Summary of Significant Accounting Policies:Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 1,052,110   $ 1,064,339
Less accumulated depreciation (591,460)   (577,115)
Property and equipment, net 460,650 $ 465,492 487,224
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 38,888   38,888
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross [1] 141,720   164,878
Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 50,776   49,509
Mobile equipment, information technology, and office furniture [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 150,935   150,712
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 639,994   629,337
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 29,797   $ 31,015
[1] As of December 31, 2018, capital lease assets were included in the "Buildings" asset class. For additional information related to leases, see Note 7, Leases.