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STOCK-BASED COMPENSATION PLANS (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) Plan $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of compensation plans | Plan |  | 3 |  |
Shares available for grant under 2014 LTIP Plan (in shares) |  | 1,083,834 |  |
Weighted-Average Exercise Price [Roll Forward] |  |  |  |
Intrinsic value of exercised options and stock-settled appreciation rights | $ |  | $ 457,000 | $ 184,000 | $ 1,312,000
Total compensation cost related to unvested equity awards | $ |  | $ 4,509,000 |  |
Weighted-average period of recognition of cost |  | 2 years 2 months 12 days |  |
Restricted Stock Award [Member] |  |  |  |
Shares or Units and Rights [Roll Forward] |  |  |  |
Outstanding, beginning balance (in shares) |  | 321,322 | 437,000 | 555,925
Granted (in shares) |  | 176,135 | 146,748 | 162,150
Exercised or restrictions lapsed (in shares) | [1] | (147,595) | (235,925) | (277,975)
Forfeited or expired (in shares) |  | (5,372) | (26,501) | (3,100)
Restricted units expected to vest (in shares) |  | 344,490 |  |
Outstanding, ending balance (in shares) |  | 344,490 | 321,322 | 437,000
Weighted-Average Award Price [Roll Forward] |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ / shares |  | $ 20.49 | $ 14.46 | $ 12.28
Granted (in dollars per share) | $ / shares |  | 23.97 | 28.72 | 18.15
Exercised or restrictions lapsed (in dollars per share) | $ / shares | [1] | 18.94 | 14.01 | 12.24
Forfeited or expired (in dollars per share) | $ / shares |  | 24.84 | 24.28 | 15.00
Restricted units expected to vest (in dollars per share) | $ / shares |  | 22.87 |  |
Outstanding, ending balance (in dollars per share) | $ / shares |  | $ 22.87 | $ 20.49 | $ 14.46
Weighted-Average Exercise Price [Roll Forward] |  |  |  |
Aggregate intrinsic value of outstanding awards | $ |  | $ 7,386,000 |  |
Fair value of vested restricted common stock | $ |  | $ 3,097,000 | $ 5,985,000 | $ 6,308,000
Period of restrictions over awards |  | 4 years |  |
Performance period |  | 1 year |  |
Vesting period of Cliff from grant date |  | 3 years |  |
Compensation expense | $ |  | $ 4,033,000 | 3,319,000 | 3,323,000
Tax benefit recognized related to all awards | $ |  | $ 1,533,000 | $ 1,261,000 | $ 1,263,000
Stock-Settled Appreciation Rights [Member] |  |  |  |
Shares or Units and Rights [Roll Forward] |  |  |  |
Outstanding, beginning balance (in shares) |  | 129,975 | 149,700 | 121,749
Granted (in shares) |  | 0 | 0 | 112,000
Exercised or restrictions lapsed (in shares) | [1] | (29,100) | (13,725) | (84,049)
Forfeited or expired (in shares) |  | 0 | (6,000) | 0
Outstanding, ending balance (in shares) |  | 100,875 | 129,975 | 149,700
Exercisable, ending balance (in shares) |  | 48,875 | 51,975 | 37,700
Weighted-Average Award Price [Roll Forward] |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ / shares |  | $ 16.04 | $ 15.78 | $ 8.85
Granted (in dollars per share) | $ / shares |  | 0 | 0 | 18.14
Exercised or restrictions lapsed (in dollars per share) | $ / shares | [1] | 8.74 | 12.30 | 8.90
Forfeited or expired (in dollars per share) | $ / shares |  |  | 18.14 | 0
Outstanding, ending balance (in dollars per share) | $ / shares |  | 18.14 | 16.04 | 15.78
Exercisable, ending balance (in dollars per share) | $ / shares |  | $ 18.14 | $ 12.88 | $ 8.76
Weighted-Average Exercise Price [Roll Forward] |  |  |  |
Aggregate intrinsic value of vested awards | $ |  | $ 161,000 |  |
Aggregate intrinsic value of outstanding awards | $ |  | $ 333,000 |  |
Options [Member] |  |  |  |
Shares [Roll Forward] |  |  |  |
Outstanding, beginning balance (in shares) |  | 0 | 0 | 50,000
Granted (in shares) |  |  |  | 0
Exercised or restrictions lapsed (in shares) | [1] |  |  | (48,000)
Forfeited or expired (in shares) |  |  |  | (2,000)
Outstanding, ending balance (in shares) |  | 0 | 0 | 0
Exercisable, ending balance (in share) |  |  | 0 | 0
Weighted-Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning balance (in dollars per share) | $ / shares |  | $ 0 | $ 0 | $ 20.56
Granted (in dollars per share) | $ / shares |  |  |  | 0
Exercised or restrictions lapsed (in dollars per share) | $ / shares | [1] |  |  | 20.75
Forfeited or expired (in dollars per share) | $ / shares |  |  |  | 15.90
Outstanding, ending balance (in dollars per share) | $ / shares |  | $ 0 | 0 | 0
Exercisable, ending balance (in dollars per share) | $ / shares |  |  | $ 0 | $ 0
[1] | The total intrinsic value of options and stock-settled appreciation rights exercised was approximately $457,000, $184,000 and $1,312,000 in 2015, 2014 and 2013, respectively.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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