Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Carrying Value and Estimated Fair Value of Other Long-term Debt Instruments

	December 31,
	2019				2018
	Carrying		Estimated		Carrying		Estimated
	Value		Fair Value		Value		Fair Value
(in thousands)
Cash and cash equivalents	$	278,620	$	278,620	$	367,577	$	367,577
First Lien Notes		747,910		682,500		747,400		714,953
Second Lien PIK Notes		325,824		183,949		291,935		285,548