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Geographic Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Total revenues by geographic area    
Revenues $ 192,638 $ 221,528
United States    
Total revenues by geographic area    
Revenues 123,819 150,960
Australia    
Total revenues by geographic area    
Revenues 6 42
Ireland    
Total revenues by geographic area    
Revenues 43,127 46,129
Singapore    
Total revenues by geographic area    
Revenues 25,554 $ 24,397
China    
Total revenues by geographic area    
Revenues $ 132