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Summary of Significant Accounting Policies Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 247,681 $ 249,417 $ 179,706 $ 203,104
Restricted cash 24,951 23,785 25,794 24,175
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 272,632 $ 273,202 $ 205,500 $ 227,279