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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements |  |  |  |  |
Increase (decrease) to cash flows provided by operating activities | $ (21,136) | $ 111,552 |  |  |
Decrease to cash flows provided by investing activities | 156,116 | (166,929) |  |  |
Decrease to net cash provided by investing activities | (566,479) | (344,544) |  |  |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash |  |  |  |  |
Cash and cash equivalents | 1,039,591 | 954,279 |  | $ 657,688 | $ 328,744
Restricted cash included in deferred expenses and other assets, net | 27,399 | 23,380 |  | 20,045 | 25,883
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows | 1,066,990 | 977,659 |  | 677,733 | 354,627
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments | 293,017 |  |  | 321,241 |
Total assets | 5,358,167 |  |  | 4,731,078 |
Retained deficit | (2,325,291) |  |  | (2,470,564) |
Total equity | $ 1,212,574 | 1,205,356 |  | $ 914,249 | $ 1,059,684
Accounting Standards Update 2016-15 |  |  |  |  |
New Accounting Pronouncements |  |  |  |  |
Increase (decrease) to cash flows provided by operating activities |  | 9,300 |  |  |
Decrease to cash flows provided by investing activities |  | 9,300 |  |  |
Accounting Standards Update 2016-18 |  |  |  |  |
New Accounting Pronouncements |  |  |  |  |
Increase (decrease) to cash flows provided by operating activities |  | (700) |  |  |
Decrease to net cash provided by investing activities |  | $ 1,800 |  |  |
Accounting Standards Update 2017-05 |  |  |  |  |
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments |  |  | $ 397,110 |  |
Total assets |  |  | 4,806,947 |  |
Retained deficit |  |  | (2,394,695) |  |
Total equity |  |  | 990,118 |  |
Impact of Adoption of ASU | Accounting Standards Update 2017-05 |  |  |  |  |
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments |  |  | 75,869 |  |
Total assets |  |  | 75,869 |  |
Retained deficit |  |  | 75,869 |  |
Total equity |  |  | $ 75,869 |  |

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