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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LONG-TERM DEBT - Convertible Senior Notes Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Equity component of convertible senior notes repurchase		$ 35,519,000	$ 3,655,000	$ 18,883,000
Loss on debt extinguishment		280,000	799,000	$ 1,895,000
Convertible senior notes due 2018
Debt Instrument [Line Items]
Debt instrument convertible conversion amount settled over principal		80,200,000
Debt conversion, converted instrument, amount		44,600,000
Equity component of convertible senior notes repurchase		35,500,000
Loss on debt extinguishment		$ 200,000	$ 100,000
Convertible senior notes due 2018
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000
Notes issued, interest rate	3.375%
Proceeds from notes payable	$ 145,100,000