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Supplemental Balance Sheet Information (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Other assets:    
Long-term investments $ 324,439,000us-gaap_LongTermInvestments $ 293,514,000us-gaap_LongTermInvestments
Deferred charges 149,092,000us-gaap_DeferredCosts 161,570,000us-gaap_DeferredCosts
Other 95,579,000us-gaap_OtherAssetsMiscellaneousNoncurrent 116,723,000us-gaap_OtherAssetsMiscellaneousNoncurrent
Total 569,110,000us-gaap_OtherAssetsNoncurrent 571,807,000us-gaap_OtherAssetsNoncurrent
Accounts payable and accrued liabilities:    
Accounts payable 268,527,000us-gaap_AccountsPayableTradeCurrent 270,067,000us-gaap_AccountsPayableTradeCurrent
Customer deposits 661,167,000us-gaap_CustomerFunds 672,440,000us-gaap_CustomerFunds
Employee related liabilities 319,963,000us-gaap_AccruedSalariesCurrent 332,072,000us-gaap_AccruedSalariesCurrent
Miscellaneous other 309,074,000us-gaap_OtherAccountsPayableAndAccruedLiabilities 370,003,000us-gaap_OtherAccountsPayableAndAccruedLiabilities
Total 1,558,731,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 1,644,582,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Buildings $ 44,000,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent