Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock ($.001 Par Value)	Paid-In Capital in Excess of Par	Retained Earnings (Accumulated Deficit)	Treasury Stock (at cost)
Beginning balance, shares at Dec. 31, 2017		402,549,346			457,041
Beginning balance at Dec. 31, 2017	$ 648,165	$ 403	$ 2,507,828	$ (1,855,810)	$ (4,256)
Issued or purchased pursuant to stock compensation plans, shares		378,595
Stock-based compensation, value	3,303		3,303
Tax withholding - stock compensation, shares					330,826
Tax withholding - stock compensation, value	(828)				$ (828)
Net income (loss)	39,578
Ending balance, shares at Mar. 31, 2018		402,927,941			787,867
Ending balance at Mar. 31, 2018	$ 690,218	$ 403	2,511,131	(1,816,232)	$ (5,084)
Beginning balance, shares at Dec. 31, 2018	462,355,725	462,355,725			1,941,749
Beginning balance at Dec. 31, 2018	$ 1,141,777	$ 462	2,685,211	(1,533,112)	$ (10,784)
Issued or purchased pursuant to stock compensation plans, shares		1,331,050
Issued or purchased pursuant to stock compensation plans, value	2	$ 2	0
Issued pursuant to directors' compensation plan, shares		41,487
Stock-based compensation, value	4,306		4,306
Tax withholding - stock compensation, shares					531,494
Tax withholding - stock compensation, value	(1,091)				$ (1,091)
Net income (loss)	$ (25,674)			(25,674)
Ending balance, shares at Mar. 31, 2019	463,728,262	463,728,262			2,473,243
Ending balance at Mar. 31, 2019	$ 1,119,320	$ 464	$ 2,689,517	$ (1,558,786)	$ (11,875)