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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]      
Capitalized Interest Costs, Including Allowance for Funds Used During Construction $ 0 $ 1,147 $ 7,107
Capitalized interest 31,196 56,980 95,294
Cash paid for income taxes, net of refunds of $918, $1,575, and $391 for 2017, 2016, and 2015, respectively 625 966 6,856
Proceeds from Income Tax Refunds $ 918 $ 1,575 $ 391