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FINANCING ARRANGEMENTS - Convertible Senior Notes (Details) - USD ($)		6 Months Ended
	Apr. 04, 2016	Jun. 30, 2018	Jun. 30, 2020	Dec. 31, 2019
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
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
Debt issuance costs	$ 4,800,000		$ 28,008,000	$ 35,131,000
Equity component of convertible debt		$ 2,000,000.0
Estimated fair value of convertible notes			$ 242,400,000	$ 262,700,000
Senior Notes
Debt Instrument [Line Items]
Conversion price (in usd per share)	$ 108.00
Share Price			$ 18.12
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.

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