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 ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Non-cash investing information:      
Change in accrued capital expenditures $ (613) $ (16,813) $ 12,850
Supplemental cash flow information:      
Cash paid for interest, net of capitalized interest [1] $ 8,679 $ 17,978 $ 2,988
[1] During the three year period ended 2016, the Company paid no federal income taxes.