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FINANCING ARRANGEMENTS - Convertible Senior Notes (Details) - USD ($) | Apr. 04, 2016 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Estimated fair value of convertible notes |  | $ 263,300,000 | $ 262,700,000
Convertible senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Net proceeds | $ 243,200,000 |  |
Stated interest rate | 3.25% |  |
Principal amount converted initially | $ 1,000 |  |
Number of shares converted (in shares) | 9.25926 |  |
Conversion price (in usd per share) | $ 108.00 |  |
Share Price |  | $ 37.99 |
Closing price of stock, trigger price (in usd per share) | 150.00% |  |
Number of threshold trading days | 20 |  |
Consecutive trading days | 30 |  |
Effective interest rate |  | 9.75% |
Debt related commitment fees and issuance costs | $ 6,800,000 |  |
Transaction costs attributable to the liability component | 4,800,000 | $ 20,510,000 | $ 35,131,000
Equity component of convertible debt | 2,000,000.0 |  |
Convertible senior notes | 2019 Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount of convertible senior notes | $ 250,000,000.0 |  |

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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51819886&loc=SL6014347-161799 + Details
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