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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accumulated depreciation on property and equipment $ 1,743,531 $ 1,524,795
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 294,426,000 291,664,000
Common stock, shares outstanding (in shares) 273,851,000 275,352,000
Treasury stock, shares held (in shares) 20,575,000 16,312,000
Customer Relationships    
Accumulated amortization $ 728,772 $ 709,824
Other Intangible Assets    
Accumulated amortization $ 664,043 $ 634,995