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SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2017
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On January 30, 2018, the Company's Board of Directors authorized an increase in its quarterly dividend from $0.45 per share to $0.50 per share, commencing with the dividend payable on April 18, 2018. On February 1, 2018, the Company completed its acquisition of Mobile Medical Examination Service ("MedXM"), in an all cash transaction for $130 million and up to $30 million of contingent consideration if certain revenue targets are achieved. MedXM is a leading national provider of home-based health risk assessments and related services. Through the acquisition, the Company acquired all of MedXM's operations. The preliminary purchase price allocation for the MedXM acquisition, which will be accounted for as a business combination, is not provided as the appraisal necessary to assess the fair values of assets acquired and liabilities assumed is not yet complete, but a significant portion of the purchase price is expected to be allocated to intangible assets and goodwill.