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STOCK-BASED COMPENSATION - Restricted stock and restricted stock unit, activity (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares
Weighted average grant date fair value |  |  |
Vested weighted average exercise price (in dollar per share) | $ 47.93 |  |
Debt instrument, convertible, conversion ratio | 0.4307 |  |
Restricted Stock |  |  |
Number of shares (in thousands) |  |  |
Nonvested ending Balance (in shares) | shares | 2,140 | 1,664 | 1,516
Granted (in shares) | shares | 1,175 | 810 | 1,082
Vested (in shares) | shares | (845) | (600) | (724)
Forfeited (in shares) | shares | (107) | (80) | (210)
Converted (in shares) | shares |  | 346 |
Nonvested ending Balance (in shares) | shares | 2,363 | 2,140 | 1,664
Weighted average grant date fair value |  |  |
Nonvested weighted average exercise price beginning balance (in dollar per share) | $ 39.58 | $ 44.26 | $ 42.97
Granted the weighted average exercise price (in dollar per share) | 43.66 | 33.94 | 41.66
Vested weighted average exercise price (in dollar per share) | 43.34 | 44.85 | 36.81
Forfeited weighted average exercise price (in dollar per share) | 39.86 | 40.20 | 44.82
Converted weighted average exercise price (in dollar per share) |  | 39.54 |
Nonvested weighted average exercise price beginning balance (in dollar per share) | $ 40.24 | $ 39.58 | $ 44.26

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- Definition Share-Based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other than Options, Converted, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21521-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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- Definition The number of grants made 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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