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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accumulated depreciation on property and equipment $ 1,045,176 $ 986,891
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 287,946,603 285,461,125
Common Stock, Shares outstanding 278,445,924 276,949,802
Treasury Stock, shares held 9,500,679 8,511,323
Customer relationships [Member]    
Accumulated Amortization $ 668,091 $ 646,850
Other intangible assets [Member]    
Accumulated Amortization $ 552,318 $ 538,381