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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accumulated depreciation on property and equipment $ 925,771 $ 850,587
Common Stock, Par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares authorized 450,000,000 450,000,000
Common Stock, Shares issued 283,809,002 279,082,473
Common Stock, Shares outstanding 279,296,316 274,955,830
Treasury Stock, shares held 4,512,686 4,126,643
Customer relationships [Member]    
Accumulated Amortization $ 625,458 $ 561,876
Other intangible assets [Member]    
Accumulated Amortization $ 523,950 $ 480,037