FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value of Assets and Liabilities Measured on Recurring Basis

In accordance with the fair value hierarchy described above, the following table shows the fair value of our financial assets and liabilities that are required to be measured at fair value on a recurring basis, which are classified on the balance sheets as cash and cash equivalents, other current assets, other current liabilities and other long-term liabilities:


	Fair Value Measurements at December 31, 2019														Fair Value Measurements at December 31, 2018
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
			(in thousands)										(in thousands)
Assets:
Cash equivalents	$	177,159	$	—	$	—	$	177,159	$	86,046	$	—	$	—	$	86,046
Forward currency contracts	—		11		—		11		—		779		—		779
Total	$	177,159	$	11	$	—	$	177,170	$	86,046	$	779	$	—	$	86,825
Liabilities:

Forward currency contracts	$	—	$	1,159	$	—	$	1,159	$	—	$	260	$	—	$	260
Put option	—		—		8,006		8,006		—		—		8,002		8,002
Subsidiary equity awards	—		—		7,661		7,661		—		—		3,571		3,571
Contingent consideration	—		—		64,892		64,892		—		—		62,475		62,475
Total	$	—	$	1,159	$	80,559	$	81,718	$	—	$	260	$	74,048	$	74,308

Fair Value of Debt

The following table presents the estimated fair values of our senior notes and convertible senior notes at December 31, 2019 and 2018:


	Estimated Fair Value at:
	December 31, 2019		December 31, 2018
	Level 2
	(in thousands)
4.75% Senior Notes Due 2027	$	983,735	$	—
4.875% Senior Notes due 2024	$	596,137	$	552,368
5.625% Senior Notes due 2026	$	320,553	$	302,097
5.375% Senior Notes due 2022	$	—	$	251,390
2.5% Convertible Senior Notes due 2023	$	675,664	$	561,699
2.5% Convertible Senior Notes due 2019	$	—	$	40,710

Fair Value of Assets Measured on a Non-recurring Basis

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 years ended December 31, 2019 and 2018:


	Fair Value		Fair Value Measurements Using								Loss
Description	Measurement		Level 1		Level 2		Level 3		(Gain)
	(in thousands)
2019
Definite-lived intangible assets, net	$	—	$	—	$	—	$	—	$	26,751
2018
Goodwill	$	20,332	$	—	$	—	$	20,332	$	10,500