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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Activity related to unrecognized tax benefits |  |  |
Unrecognized benefits, including interest and penalties | $ 20,000 | $ 18,900 | $ 16,500
Increase from prior period positions | 1,400 |  |
Settlement of prior year positions | 800 |  |
Decrease from lapse in statue of limitations | 1,800 |  |
Gross unrecognized tax benefits at the beginning of the period | 17,216 | 15,499 | 14,050
Increase in unrecognized tax benefits taken during a prior period | 561 |  | 177
Increase in unrecognized tax benefits taken during the current period | 2,321 | 1,717 | 1,498
Lapse in statute of limitations | (1,673) |  | (226)
Settlements | (521) |  |
Gross unrecognized tax benefits at the end of the period | 17,904 | 17,216 | 15,499
Interest and penalties accrued | 2,100 | $ 1,700 | $ 1,000
Unrecognized tax benefits that would affect the effective tax rate if recognized | $ 20,000 |  |

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- Definition Unrecognized tax benefit cumulative increase from prior period positions. + References No definition available. + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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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 settlements with taxing authorities. + 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)(3) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + 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)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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