Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Non-Cash Investing and Supplemental Cash Flow Information) (Details)

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Summary of Significant Accounting Policies (Non-Cash Investing and Supplemental Cash Flow Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-cash investing information      
Change in accrued capital expenditures $ (52,757,000) $ (39,532,000) $ (613,000)
Supplemental cash flow information      
Cash paid for interest, net of capitalized interest 0 $ 0 $ 8,679,000
Federal      
Supplemental cash flow information      
Income taxes paid $ 0