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SHARE-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract] |  |  |
Liability for cash-settled restricted stock units | $ 7,878 |  | $ 20,648
Restricted Stock Units (RSUs) |  |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Line Items] |  |  |
Share based compensation costs incurred | 15,000 | $ 16,000 |
Tax benefit related to share-based compensation costs | 2,000 | 2,000 |
Fair value - vested during period | 48,000 | 42,000 |
Unrecognized compensation costs | $ 121,000 | $ 137,000 |
Unrecognized compensation costs - weighted average period expected to be recognized | 2 years 11 months | 3 years |
Restricted Stock Units (RSUs) | Cash Settled |  |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract] |  |  |
Liability for cash-settled restricted stock units | $ 8,000 | $ 9,000 |
Performance Vesting Restricted Stock Units | Share Settled |  |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward] |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 232 |  |
Granted (in shares) | 127 |  |
Vested (in shares) | (61) |  |
Forfeited (in shares) | 0 |  |
Nonvested restricted stock units - end of period (in shares) | 298 |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract] |  |  |
Weighted average grant date fair value - beginning of period (in usd per share) | $ 54.54 |  |
Weighted average grant date fair value - granted (in usd per share) | 54.70 |  |
Weighted average grant date fair value - vested (in usd per share) | 53.82 |  |
Weighted average grant date fair value - forfeited (in usd per share) | 0.00 |  |
Weighted average grant date fair value - end of period (in usd per share) | $ 54.76 |  |
Performance Vesting Restricted Stock Units | Cash Settled |  |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward] |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 27 |  |
Granted (in shares) | 0 |  |
Vested (in shares) | (12) |  |
Forfeited (in shares) | 0 |  |
Nonvested restricted stock units - end of period (in shares) | 15 |  |
Service Based Restricted Stock Units | Share Settled |  |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward] |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 1,411 |  |
Granted (in shares) | 508 |  |
Vested (in shares) | (445) |  |
Forfeited (in shares) | (74) |  |
Nonvested restricted stock units - end of period (in shares) | 1,400 |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Abstract] |  |  |
Weighted average grant date fair value - beginning of period (in usd per share) | $ 54.12 |  |
Weighted average grant date fair value - granted (in usd per share) | 54.67 |  |
Weighted average grant date fair value - vested (in usd per share) | 54.04 |  |
Weighted average grant date fair value - forfeited (in usd per share) | 54.84 |  |
Weighted average grant date fair value - end of period (in usd per share) | $ 54.31 |  |
Service Based Restricted Stock Units | Cash Settled |  |  |
Reconcilation of Beginning and Ending Balance of Nonvested Restricted Stock (including RSUs) [Roll Forward] |  |  |
Nonvested restricted stock units - beginning of period (in shares) | 932 |  |
Granted (in shares) | 349 |  |
Vested (in shares) | (320) |  |
Forfeited (in shares) | (35) |  |
Nonvested restricted stock units - end of period (in shares) | 926 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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