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Summary of Significant Accounting Policies Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 179,706 $ 203,104 $ 167,007 $ 193,862
Restricted cash 25,794 24,175 22,047 16,488
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 205,500 $ 227,279 $ 189,054 $ 210,350