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Organization, Basis of Presentation and Significant Accounting Policies (Details 4) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities | $ 315,913 | $ 299,895
Net cash used in investing activities | (319,280) | (108,880)
Net cash used in financing activities | 72,868 | (152,272)
Net increase in cash, cash equivalents and restricted cash | 69,501 | 38,743
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 | 137,244 | 121,705
Cash and cash equivalents and restricted cash, end of period | $ 271,407 | 368,720
Scenario, Previously Reported [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 293,462
Net cash used in investing activities |  | (235,347)
Net cash used in financing activities |  | (151,404)
Net (decrease) increase in cash, cash equivalents |  | (93,289)
Cash, cash equivalents, beginning of period |  | 214,994
Cash, cash equivalents, end of period |  | 121,705
Impact of ASU 2016-18 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 6,433
Net cash used in investing activities |  | 126,467
Net cash used in financing activities |  | (868)
Net (decrease) increase in cash, cash equivalents |  | 93,289
Net increase in cash, cash equivalents and restricted cash |  | 38,743
Cash, cash equivalents, beginning of period |  | (214,994)
Cash and cash equivalents and restricted cash, end of period |  | $ 247,015

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