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Significant Accounting Policies - Correction of Cash Flow Classification (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Net cash provided by (used in) financing activities |  | $ 86,944 | $ (205,771)
Net cash used in investing activities |  | $ (494,620) | $ (79,116)
Correction of error |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Net cash provided by (used in) financing activities | $ (261,100) |  |
Net cash used in investing activities | $ 261,100 |  |

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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