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STOCK-BASED COMPENSATION PLANS - Time Vested Stock Awards (Details) | 3 Months Ended
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Mar. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based award weighting | 50.00% |
Requisite service period of awards | 3 years |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 695 |
Grant Date Fair Value Per Share | $ / shares | $ 43.11 | [1]
Stock based compensation, vesting period | 3 years |
Performance Shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share based award weighting | 50.00% |
Stock based compensation, vesting period | 3 years |
Equity and Incentive Plan 2012 | MSPP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation discount on shares (percent) | 33.00% |
Equity and Incentive Plan 2012 | January 3, 2017 | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 5,914 |
Grant Date Fair Value Per Share | $ / shares | $ 43.99 | [1],[2],[3]
Stock based compensation, vesting period | 3 years |
Equity and Incentive Plan 2012 | February 28, 2017 | MSPP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 3,795 |
Grant Date Fair Value Per Share | $ / shares | $ 14.15 | [3],[4]
Stock based compensation, vesting period | 2 years |
Equity and Incentive Plan 2012 | March 15, 2017 | DCRP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 2,772 |
Grant Date Fair Value Per Share | $ / shares | $ 42.66 | [1]
Stock based compensation, number of shares vested | 1,303 |
Shares vesting ratably | 1,469 |
Retirement age of participant | 65 |
Equity and Incentive Plan 2012 | March 16, 2017 | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 853 |
Grant Date Fair Value Per Share | $ / shares | $ 43.11 | [1],[3]
Stock based compensation, vesting period | 3 years |
Equity and Incentive Plan 2012 | March 16, 2017 | MSPP |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 4,293 |
Grant Date Fair Value Per Share | $ / shares | $ 14.37 | [3],[4]
Stock based compensation, vesting period | 2 years |
Equity and Incentive Plan 2012 | March 16, 2017 | Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares/Units Granted (in shares) | 17,575 |
Grant Date Fair Value Per Share | $ / shares | $ 43.11 | [1]
Stock based compensation, vesting period | 5 years |
[1] | (3)The grant date fair value per share (or unit) was determined based on the closing market price of the Company's common stock on the grant date.
[2] | (1)Share-based awards issued under the 2017-2019 LTIP to the executive officers of the Company were 50% weighted on meeting the 3 year requisite service period (i.e. restricted stock) and 50% weighted on the attainment of certain performance targets as selected by the Company's Compensation Committee and as approved by the Company's Board of Directors.
[3] | (2)Unvested awards participate fully in the rewards of stock ownership of the Company, including dividends and voting rights.
[4] | (4)MSPP awards are purchased by certain employees and executive officers of the Company at a one-third discount, based on the closing market price of the Company's common stock on the grant date. The grant date fair value per share equals the one-third discount received.

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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