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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accumulated depreciation on property and equipment $ 1,379,864 $ 1,236,523
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) 291,397,000 289,138,000
Common Stock, Shares outstanding (in shares) 275,125,000 274,342,000
Treasury Stock, Shares held (in shares) 16,272,000 14,796,000
Customer relationships [Member]    
Accumulated Amortization $ 699,703 $ 687,072
Other intangible assets [Member]    
Accumulated Amortization $ 616,590 $ 594,015