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Recently Adopted Accounting Standards, ASU 2016-18, Statement of Cash Flows (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 72,093 $ 79,491    
Restricted cash equivalents 8,141 8,115    
Total cash, cash equivalents and restricted cash equivalents 80,234 87,606 $ 69,542 $ 71,515
ASU 2016-18 [Member]        
Statement of Cash Flows [Abstract]        
Cash and cash equivalents 72,093 79,491 61,495 63,481
Restricted cash equivalents 8,141 8,115 8,047 8,034
Total cash, cash equivalents and restricted cash equivalents $ 80,234 $ 87,606 $ 69,542 $ 71,515