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STOCKHOLDERS' EQUITY, Repurchase of Common Stock (Details) - $ / shares | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Repurchase of common stock [Abstract] |  |
Number of shares authorized to be repurchased (in shares) | 3,763,038 |
Aggregate number of shares repurchased since inception (in shares) | 2,171,934 |
Number of shares remaining in treasury (in shares) | 0 |
Number of shares acquired under stock repurchase plan and subsequently reissued (in shares) | 21,099 | 23,651
Treasury stock acquired, average cost (in dollars per share) | $ 82.53 | $ 62.51

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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