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
 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