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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements |  |  |  |  |
Increase to cash flows provided by operating activities | $ (36,617) | $ 99,921 |  |  |
Decrease to cash flows provided by investing activities | 428,003 | (1,038,643) |  |  |
Decrease to net cash provided by investing activities | (579,215) | (440,928) |  |  |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash |  |  |  |  |
Cash and cash equivalents | 757,384 | 1,912,448 |  | $ 657,688 | $ 328,744
Restricted cash included in deferred expenses and other assets, net | 34,974 | 21,690 |  | 20,045 | 25,883
Total cash, cash equivalents and restricted cash reported in the consolidated statements of cash flows | 792,358 | 1,934,138 |  | 677,733 | 354,627
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments | 302,318 |  |  | 321,241 |
Total assets | 5,079,989 |  |  | 4,731,078 |
Retained earnings (deficit) | (2,350,438) |  |  | (2,470,564) |
Total equity | $ 1,192,202 | 923,889 |  | $ 914,249 | $ 1,059,684
Accounting Standards Update 2016-15 |  |  |  |  |
New Accounting Pronouncements |  |  |  |  |
Increase to cash flows provided by operating activities |  | 11,800 |  |  |
Decrease to cash flows provided by investing activities |  | 11,800 |  |  |
Accounting Standards Update 2016-18 |  |  |  |  |
New Accounting Pronouncements |  |  |  |  |
Increase to cash flows provided by operating activities |  | 1,300 |  |  |
Decrease to net cash provided by investing activities |  | $ 5,500 |  |  |
Accounting Standards Update 2017-05 |  |  |  |  |
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments |  |  | $ 397,110 |  |
Total assets |  |  | 4,806,947 |  |
Retained earnings (deficit) |  |  | (2,394,695) |  |
Total equity |  |  | 990,118 |  |
Accounting Standards Update 2017-05 | Impact of Adoption of ASU |  |  |  |  |
Impact of Adoption on Consolidated Financial Statements |  |  |  |  |
Other investments |  |  | 75,869 |  |
Total assets |  |  | 75,869 |  |
Retained earnings (deficit) |  |  | 75,869 |  |
Total equity |  |  | $ 75,869 |  |

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