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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Disclosure of Cash Flow Information      
Cash paid for interest, net of amounts capitalized $ (2,157) $ (4,045) $ (2,438)
Cash received for income taxes 0 4,381 4,348
Supplemental Disclosure of Noncash Investing and Financing Activities      
Purchase of PP&E in accounts payable 4,592 34,235 50,096
Right-of-use assets obtained in exchange for financing lease obligations 3,347    
Carrying value of properties exchanged 5,384 0 0
Equity issued for debt $ 0 $ 0 $ (268,779)