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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance For Doubtful Accounts [Member]      
Movement In Valuation Allowances And Reserves [Roll Forward]      
Valuation allowance and qualifying accounts, beginning balance $ 32,396 $ 47,745 $ 55,040
Charges to costs, expenses and other 30,579 14,167 20,243
Write-off of accounts receivable 26,310 27,014 28,272
Adjustments and other (1,776) (2,502) 734
Valuation allowance and qualifying accounts, ending balance 34,889 32,396 47,745
Valuation Allowance Of Deferred Tax Assets [Member]      
Movement In Valuation Allowances And Reserves [Roll Forward]      
Valuation allowance and qualifying accounts, beginning balance 655,658 327,623 183,686
Charges to costs, expenses and other 314,098 356,583 149,107
Write-off of accounts receivable (457) (230) (5)
Adjustments and other (24,723) (28,318) (5,165)
Valuation allowance and qualifying accounts, ending balance 944,576 655,658 $ 327,623
Valuation Allowance Of Deferred Tax Assets [Member] | Federal and state tax authority [Member]      
Movement In Valuation Allowances And Reserves [Roll Forward]      
Operating Loss Carryforwards, Valuation Allowance $ 305,300 $ 339,800