Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2019	$ (697,223)	$ (25)	$ 2,157	$ 810,856	$ (14,024)	$ 101,741
Balance (in shares) at Dec. 31, 2019			21,573		930
Net income (loss)	(16,008)	0	$ 0	0	$ 0	(16,008)
Restricted stock awards, forfeitures and shares repurchased for tax withholdings, net	0	0	$ 0	(32)	$ 104	72
Restricted stock awards, forfeitures and shares repurchased for tax withholdings, net (in shares)			0		(6)
Stock-based compensation expense	0	0	$ 0	3	$ 0	3
Balance at Mar. 31, 2020	(713,231)	(25)	$ 2,157	810,827	$ (13,920)	85,808
Balance (in shares) at Mar. 31, 2020			21,573		924
Balance at Dec. 31, 2020	(736,639)	(25)	$ 2,157	807,582	$ (10,200)	62,875
Balance (in shares) at Dec. 31, 2020			21,573		688
Net income (loss)	17,625	0	$ 0	0	$ 0	17,625
Restricted stock awards, forfeitures and shares repurchased for tax withholdings, net	0	0	$ 0	(593)	$ 963	370
Restricted stock awards, forfeitures and shares repurchased for tax withholdings, net (in shares)			0		(58)
Stock-based compensation expense	0	0	$ 0	122	$ 0	122
Balance at Mar. 31, 2021	$ (719,014)	$ (25)	$ 2,157	$ 807,111	$ (9,237)	$ 80,992
Balance (in shares) at Mar. 31, 2021			21,573		630