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Significant Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]        
Cash and cash equivalents $ 65,939 $ 74,677 $ 39,743  
Restricted cash 1,062      
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 67,730 $ 76,444 39,934 $ 39,020
Included In Deposits And Other [Member]        
Restricted Cash and Cash Equivalents Items [Line Items]        
Restricted cash $ 729   $ 191