XML 64 R46.htm IDEA: XBRL DOCUMENT v3.8.0.1
Significant Accounting Policies (Schedule, Cash, Cash Equivalent, Restricted Cash) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Cash and cash equivalents $ 46,156 $ 118,799 $ 57,686  
Restricted cash 136,667 131,442 111,282  
Cash, cash equivalents and restricted cash $ 182,823 $ 250,241 $ 168,968 $ 185,985