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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Allowance for doubtful accounts	$ 49,709	$ 11,985
Accumulated amortization of other intangible assets	$ 15,084	$ 12,853
STOCKHOLDERS’ EQUITY:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	100,000,000	100,000,000
Common stock issued (in shares)	75,200,000	74,960,000
Common stock outstanding (in shares)	73,733,000	73,436,000
Common stock in treasury (in shares)	1,467,000	1,524,000

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