FAIR VALUE MEASUREMENTS Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities Measured on a Recurring Basis

The following table shows the fair value of our significant financial assets that are required to be measured at fair value on a recurring basis, which are classified on the consolidated balance sheets as cash and cash equivalents and other long-term liabilities.

	Estimated Fair Value
	March 31, 2020						December 31, 2019
	Level 1		Level 2		Total		Level 1		Level 2		Total
	(in thousands)
Assets:
Cash equivalents	$	537,355	$	—	$	537,355	$	193,005	$	—	$	193,005
Liabilities:
Interest rate swap	$	—	$	30,831	$	30,831	$	—	$	—	$	—

Estimated Fair Values of Debt

The following table presents the estimated fair values of our senior notes and convertible senior notes:

	Estimated Fair Value at
	March 31, 2020		December 31, 2019
	Level 2
	(in thousands)
4.75% Senior Notes due 2027	$	849,366	$	983,735
4.875% Senior Notes due 2024	$	534,451	$	596,137
5.625% Senior Notes due 2026	$	271,479	$	320,553
2.5% Convertible Senior Notes due 2023	$	517,473	$	675,664
2.0% Convertible Senior Notes Due 2025	$	322,036	$	—

Fair Value Measurements, Nonrecurring

The following table shows the fair value of our financial assets that have been adjusted to fair value on a non-recurring basis, which had a significant impact on our results of operations for the three months ended March 31, 2020.

			Fair Value Measurements Using
Description	Fair Value Measurement		Level 1		Level 2		Level 3		Loss (Gain)
2020			(in thousands)
Definite-lived intangible assets, net	$	7,390	$	—	$	—	$	7,390	$	10,068