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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward] |  |
Beginning Balance | $ 6,589,454 |
Other comprehensive (loss) income before reclassifications | 13,920 |
Amounts reclassified from accumulated other comprehensive income | 98 |
Ending Balance | 6,242,056 |
Deferred net losses from terminated hedges | 2,200 | $ 3,200
Net unrealized (loss) gain on derivative instruments |  |
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward] |  |
Beginning Balance | 12,542 |
Other comprehensive (loss) income before reclassifications | 9,837 |
Amounts reclassified from accumulated other comprehensive income | 237 |
Ending Balance | 22,616 |
Net unrealized gain on marketable securities |  |
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward] |  |
Beginning Balance | 1,042 |
Other comprehensive (loss) income before reclassifications | (14) |
Amounts reclassified from accumulated other comprehensive income | 0 |
Ending Balance | 1,028 |
Accumulated Other Comprehensive Income |  |
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward] |  |
Beginning Balance | 18,604 |
Ending Balance | 32,622 |
Joint venture | Net unrealized (loss) gain on derivative instruments |  |
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward] |  |
Beginning Balance | 5,020 |
Other comprehensive (loss) income before reclassifications | 4,097 |
Amounts reclassified from accumulated other comprehensive income | (139) |
Ending Balance | $ 8,978 |

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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