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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Other assets:    
Long-term investments $ 425,732 $ 412,369
Other 99,041 113,522
Total 524,773 525,891
Accounts payable and accrued liabilities:    
Accounts payable 293,538 302,113
Customer deposits 688,772 665,339
Employee related liabilities 205,901 255,893
Other 190,611 224,976
Total $ 1,378,822 $ 1,448,321