Consolidated Statements of Shareholders Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]		Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance at Dec. 31, 2017	$ (79,158)		$ 555		$ (481)	$ 288,980	$ (368,212)
Beginning balance, Shares at Dec. 31, 2017			54,863	[1]	618
Impact of adoption of new accounting standards | Accounting Standards Update (ASU) 2014-09 [Member]		$ (5,420)						$ (5,420)
Net income	181,313						181,313
Ending Balance at Dec. 31, 2018	96,735		$ 555		$ (481)	288,980	(192,319)
Ending balance, shares at Dec. 31, 2018			54,863	[1]	618
Net income	(19,214)						(19,214)
Ending Balance at Dec. 31, 2019	$ 77,521		$ 555		$ (481)	$ 288,980	$ (211,533)
Ending balance, shares at Dec. 31, 2019			54,863	[1]	618

[1] Common stock, $.01 par value, 100,000 shares authorized and 55,481 shares issued at December 31, 2019 and 2018. Shares outstanding at December 2019 and 2018 were 54,863