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INCOME TAXES (Summary of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
INCOME TAXES |  |  |
Unrecognized tax benefits related to deferred tax assets and federal tax benefit of state income tax items | $ 16,700 |  |
Decrease in provision for income taxes due to reduction of gross unrecognized tax benefits | 1,400 |  |
Accrued interest and penalties | 400 | $ 400 |
Unrecognized tax benefits |  |  |
Beginning balance-gross unrecognized tax benefits (UTB's) | 20,137 | 22,694 |
Additions based on tax positions related to the current year |  |  | $ 48
Reductions for tax positions related to prior years |  |  | (835)
Lapse of statute of limitations | (1,409) | (2,557) | (21,901)
Ending balance-gross unrecognized tax benefits ("UTB"s) | 18,728 | 20,137 | 22,694
UTB's as a credit in deferred taxes | (14,604) | (14,604) | (14,604)
Federal benefit of state taxes | (2,063) | (2,063) | (2,063)
UTB's that would impact the effective tax rate | $ 2,061 | $ 3,470 | $ 6,027

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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