Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Capital in Excess of Par	Retained Deficit
Balance (in shares) at Dec. 31, 2017		1,459,000	201,836,000
Balance at Dec. 31, 2017	$ 1,855,966	$ 15	$ 2,018	$ 2,181,359	$ (327,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	55,761				55,761
Shares issued pursuant to employee benefit plans (in shares)			7,000
Shares issued pursuant to employee benefit plans	88			88
Restricted stock (in shares)			105,000
Restricted stock	1,153		$ 1	1,152
Preferred stock dividend	(1,824)				(1,824)
Balance (in shares) at Mar. 31, 2018		1,459,000	201,948,000
Balance at Mar. 31, 2018	1,911,144	$ 15	$ 2,019	2,182,599	(273,489)
Balance (in shares) at Dec. 31, 2018		1,459,000	227,583,000
Balance at Dec. 31, 2018	2,445,208	$ 15	$ 2,276	2,477,278	(34,361)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(19,543)				(19,543)
Shares issued pursuant to employee benefit plans (in shares)			24,000
Shares issued pursuant to employee benefit plans	154			154
Restricted stock (in shares)			277,000
Restricted stock	4,450		$ 3	4,447
Preferred stock dividend	(1,824)				(1,824)
Balance (in shares) at Mar. 31, 2019		1,459,000	227,884,000
Balance at Mar. 31, 2019	$ 2,428,445	$ 15	$ 2,279	$ 2,481,879	$ (55,728)