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INCOME TAXES - Changes in Liability for Tax Uncertainties, Excluding Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Changes in liability for tax uncertainties, excluding interest |  |  |
Balance at beginning of year | $ 60,576 | $ 45,126 | $ 40,317
Additions for tax positions related to the current year | 14,119 | 14,916 | 11,545
Additions for tax positions of prior years | 13,215 | 2,653 | 5,318
Reductions for tax positions of prior years | (14,774) | (1,616) | (4,109)
Reductions due to statute lapse | (1,527) | (402) | (1,271)
Settlements, audit payments, refunds - net | (12,928) | (101) | (6,674)
Balance at end of year | $ 58,681 | $ 60,576 | $ 45,126

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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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