Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Estimated Fair Values of Financial Instruments

The estimated fair values of financial instruments are as follows (in thousands):

	March 31, 2019				December 31, 2018
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial liabilities:
Notes payable	$	255,231	$	255,231	$	198,019	$	198,019
7% Senior Notes due 2022	347,639		351,330		347,456		350,000
6% Senior Notes due 2023	344,206		337,750		343,878		315,000
5.875% Senior Notes due 2025	428,430		411,241		431,992		378,611