Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Recurring fair value measurements

Recurring fair value measurements consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Cash equivalent money market funds (Level 1)	$	463,245	$	74,407
Restricted cash money market funds (Level 1)	2,589		2,589

Fair value of financial instruments that are not recorded at fair value on recurring basis

The following table presents the fair value of financial instruments that are not recorded at fair value on a recurring basis:

	March 31, 2019				December 31, 2018
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	1,067,500	$	1,043,595	$	526,131	$	524,978
Revolving credit facilities and term loans (Level 2)	815,432		810,369		803,867		807,333
Total debt	$	1,882,932	$	1,853,964	$	1,329,998	$	1,332,311