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Summary of Significant Accounting Policies and Critical Accounting Estimates (Cash and Cash Equivalents) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]        
Cash at bank and on hand $ 137,615 $ 217,644    
Short-term bank deposits 301,565 72,367    
Cash and Cash Equivalents $ 439,180 $ 290,011 $ 392,667 $ 330,303