Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Financial Instruments Measured on Recurring Basis

The carrying amounts and estimated fair values of our senior notes were as follows:

		March 31, 2020		December 31, 2019
Financial Instrument	Fair Value Input Level	Carrying Value	Fair Value	Carrying Value	Fair Value
		(In thousands)
Liabilities:
6% Senior Notes	Level 2	—	—	496,531	522,045
5% Senior Notes	Level 2	491,654	416,795	—	—