Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details 2)

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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