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Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities | $ 121,667 | $ 169,428
Net cash used in investing activities | (152,686) | (52,470)
Net decrease in cash and cash equivalents and restricted cash | (1,899) | (199,995)
Beginning of period | 14,831 | 212,619
End of period | $ 12,932 | 12,624
Accounting Standards Update 2016-18 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | (1,250)
Net cash used in investing activities |  | 260
Net decrease in cash and cash equivalents and restricted cash |  | (990)
Beginning of period |  | 2,756
End of period |  | 1,766
As Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 170,678
Net cash used in investing activities |  | (52,730)
Net decrease in cash and cash equivalents and restricted cash |  | (199,005)
Beginning of period |  | 209,863
End of period |  | $ 10,858

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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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