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STOCKHOLDERS' EQUITY. (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Stockholders' Equity Note [Line Items] |  |
Cash dividends declared per share | $ 0.7 | $ 0.57
Accounts payable and accrued expenses | $ 22.2 |
Regular cash dividend [Member] |  |
Stockholders' Equity Note [Line Items] |  |
Cash dividends declared per share | $ 0.7 | $ 0.57

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- Definition [Line Items] for Stockholders' Equity Note [Table] + References No definition available. + Details
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- Definition Unsettled Common Stock Repurchases Liabilities + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Details
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