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Organization, Basis of Presentation and Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities | $ 625,297 | $ 575,656
Net cash used in investing activities | (316,681) | (253,724)
Net cash used in financing activities | (160,625) | (358,756)
Net increase in cash, cash equivalents and restricted cash | 147,991 | (36,824)
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 | 101,565 | 53,477
Cash and cash equivalents and restricted cash, end of period | $ 349,897 | 293,153
Impact of ASU 2016-18 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 13,296
Net cash used in investing activities |  | 112,890
Net cash used in financing activities |  | (1,493)
Net (decrease) increase in cash, cash equivalents |  | 161,517
Net increase in cash, cash equivalents and restricted cash |  | (36,824)
Cash, cash equivalents, beginning of period |  | (214,994)
Cash and cash equivalents and restricted cash, end of period |  | 239,676
Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 562,360
Net cash used in investing activities |  | (366,614)
Net cash used in financing activities |  | (357,263)
Net (decrease) increase in cash, cash equivalents |  | (161,517)
Cash, cash equivalents, beginning of period |  | 214,994
Cash, cash equivalents, end of period |  | $ 53,477

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