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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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Face amount or stated value per share of common stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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