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CONDENSED CONSOLIDATED BALANCE SHEETS (parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 35,358 $ 34,042
Mandatorily redeemable preferred securities authorized (in shares) 1,000,000 1,000,000
Mandatorily redeemable preferred securities par value (in dollars per share) $ 0.01 $ 0.01
Mandatorily redeemable preferred securities issued (in shares) 750,000 750,000
Mandatorily redeemable preferred securities outstanding (in shares) 750,000 750,000
Common stock authorized (in shares) 3,999,000,000 3,999,000,000
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock issued (in shares) 766,843,596 641,118,571
Common stock outstanding (in shares) 766,843,596 641,118,571