Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Costs relating to construction included in accounts payable and accrued expenses | $ 32,060 | $ 22,908 | $ 28,665 |
| Interest paid, net of interest capitalized | $ 56,730 | $ 50,270 | 49,542 |
| Dividend Declared [Member] | |||
| Special Dividend | $ 21,200 | ||
| X | ||||||||||
- Definition Expenditures Included In Construction Trade Payables No definition available.
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| X | ||||||||||
- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of cash paid, after deduction of cash paid for capitalized interest, for interest. Includes, but is not limited to, payment to settle zero-coupon bond for 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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| X | ||||||||||
- Details
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