Summary of Significant Accounting Policies (Non-Cash Investing and Supplemental Cash Flow Information) (Details) - USD ($) |
12 Months Ended | ||
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Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Non-cash investing information | |||
| Change in accrued capital expenditures | $ (39,532,000) | $ (613,000) | $ (16,813,000) |
| Supplemental cash flow information | |||
| Cash paid for interest, net of capitalized interest | 0 | $ 8,679,000 | $ 17,978,000 |
| Federal | |||
| Income Tax Contingency [Line Items] | |||
| Income taxes paid | $ 0 | ||
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- References No definition available.
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- Details
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