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Disposition of Business - Carrying Amounts of Assets and Liabilities Disposed Of (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
May 22, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Non-redeemable noncontrolling interest divested $ 1,606,233 $ 1,560,802  
Disposal Group, Not Discontinued Operations | eLong, Inc      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Total current assets     $ 350,196
Total long-term assets     137,709
Total assets divested     487,905
Total current liabilities     187,296
Total long-term liabilities     5,782
Total liabilities divested     193,078
Components of accumulated other comprehensive income divested     45,259
Non-redeemable noncontrolling interest divested     92,550
Net carrying value divested     157,018
Cash and cash equivalents     $ 74,000