Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

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:

	June 30, 2017		December 31, 2016
	(In thousands)
Cash equivalent money market funds (Level 1)	$	245,933	$	39,548
Restricted cash money market funds (Level 1)	2,000		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:

	June 30, 2017				December 31, 2016
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior notes (Level 1)	$	947,393	$	922,517	$	954,765	$	922,140
Revolving credit facilities and term loans (Level 2)	646,171		645,723		551,793		552,690
Total debt	$	1,593,564	$	1,568,240	$	1,506,558	$	1,474,830