XML 77 R47.htm IDEA: XBRL DOCUMENT v3.7.0.1
Cash, Cash Equivalents and Short-term Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash and cash equivalents:        
Cash $ 364,766 $ 186,347    
Cash equivalents:        
Bank time deposits   51,093    
Total cash and cash equivalents 364,766 237,440 $ 284,865 $ 249,099
Short-term investments:        
Bank time deposits 31,188 98,439    
Total cash, cash equivalents and short-term investments 395,954 335,879    
Interest income $ 7,600 $ 5,500 $ 8,300