STOCK-BASED COMPENSATION PLANS - Defined Contribution Plan and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan
Matching percentage per dollar of the first 3% of participant deferral	100.00%	100.00%	100.00%
First specified percentage of participant deferral upon which employer matches 100% contribution per dollar	3.00%	3.00%	3.00%
Matching percentage per dollar of the next 2% contribution	50.00%	50.00%	50.00%
Next specified percentage of employee contribution upon which employer matches 50% contribution per dollar	2.00%	2.00%	2.00%
Participant deferral (as a percent)	5.00%	5.00%	5.00%
Net costs related to defined contribution plan	$ 1,090	$ 1,085	$ 1,076
Dividends
Dividends paid (in dollars per share)	$ 0.10	$ 0.10	$ 0.10
Total dividends paid	$ 959	$ 942	$ 923
Maximum
Defined Contribution Plan
Specified percentage of employee contribution upon which employer matches contribution	4.00%	4.00%	4.00%

Represents the first specified percentage of participant deferral upon which employer matches contribution.

No definition available.

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- Definition

Represents the next specified percentage of employee contribution upon which employer matches contribution.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage employer matches the employee's first specified percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage employer matches the employee's next specified percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Aggregate dividends paid 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

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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