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CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 240,918 $ 252,056
Property and equipment, accumulated depreciation 3,130,797 2,832,160
Intangible assets, accumulated amortization $ 1,035,664 $ 940,731
Preferred stock, par value (usd per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (usd per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 194,774,810 194,554,491
Common stock, shares outstanding (in shares) 191,200,237 194,554,491
Treasury Stock, Common, Shares 3,574,573 0