Annual report pursuant to Section 13 and 15(d)

Schedule of Total Cash, Cash Equivalents and Restricted Cash (Details)

v3.8.0.1
Schedule of Total Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash, Cash Equivalents and Restricted Cash [Abstract]        
Cash and cash equivalents $ 419,159 $ 350,864 $ 1,000,393  
Restricted cash 635,836 408,052 262,562  
Total cash, cash equivalents and restricted cash $ 1,054,995 $ 758,916 $ 944,055 $ 1,342,563