Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Valuation of money market funds and restricted cash using quoted market prices in active markets for identical assets

Recurring fair value measurements consist of the following:

	December 31,
	2018		2017
	(In thousands)
Cash equivalent money market funds (Level 1)	$	74,407	$	121,627
Restricted cash money market funds (Level 1)	2,589		2,000

Financial instruments that are not recorded at fair value

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

	December 31, 2018				December 31, 2017
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	526,131	$	524,978	$	745,943	$	723,867
Revolving credit facilities and term loans (Level 2)	803,867		807,333		639,689		640,562
Total financial instruments	$	1,329,998	$	1,332,311	$	1,385,632	$	1,364,429