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Organization, Basis of Presentation and Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities | $ 981,359 | $ 933,778
Net cash used in investing activities | (495,456) | (624,752)
Net cash used in financing activities | (406,218) | (421,892)
Net increase in cash, cash equivalents and restricted cash | 79,685 | (112,866)
Cash, cash equivalents, beginning of period | 67,088 |
Cash and cash equivalents and restricted cash, beginning of period | 201,906 | 329,977
Cash, cash equivalents, end of period | 55,887 | 36,042
Cash and cash equivalents and restricted cash, end of period | $ 281,591 | 217,111
Impact of ASU 2016-18 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 16,205
Net cash used in investing activities |  | 51,479
Net cash used in financing activities |  | (1,598)
Net (decrease) increase in cash, cash equivalents |  | 178,952
Net increase in cash, cash equivalents and restricted cash |  | (112,866)
Cash, cash equivalents, beginning of period |  | (214,994)
Cash and cash equivalents and restricted cash, end of period |  | 181,069
Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 917,573
Net cash used in investing activities |  | (676,231)
Net cash used in financing activities |  | (420,294)
Net (decrease) increase in cash, cash equivalents |  | (178,952)
Cash, cash equivalents, beginning of period |  | 214,994
Cash, cash equivalents, end of period |  | $ 36,042

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