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Summary of Significant Accounting Policies (Reconciliation of Cash, Cash Equivalents, and Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]        
Cash and cash equivalents $ 76,639 $ 120,457 $ 82,584  
Restricted cash included in other long-term assets $ 2,802      
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent  
Total cash, cash equivalents, and restricted cash $ 79,441 $ 120,457 $ 82,584 $ 7,925