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Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities | $ 80,712 | $ 117,529
Net cash used in investing activities | (96,808) | (58,777)
Net decrease in cash and cash equivalents and restricted cash | (2,254) | (199,292)
Beginning of period | 14,831 | 212,619
End of period | $ 12,577 | 13,327
Accounting Standards Update 2016-18 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | (208)
Net cash used in investing activities |  | 173
Net decrease in cash and cash equivalents and restricted cash |  | (35)
Beginning of period |  | 2,756
End of period |  | 2,721
As Previously Reported |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Net cash provided by operating activities |  | 117,737
Net cash used in investing activities |  | (58,950)
Net decrease in cash and cash equivalents and restricted cash |  | (199,257)
Beginning of period |  | 209,863
End of period |  | $ 10,606

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