Annual report pursuant to Section 13 and 15(d)

Property and Equipment. (Details)

v3.21.1
Property and Equipment. (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property and Equipment. (Details) [Line Items]    
Depreciation expense $ 30,268,000 $ 40,931,000
Capital Investment Activities [Member]    
Property and Equipment. (Details) [Line Items]    
Capitalized interest $ 224,000 $ 563,000