Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance, beginning at Dec. 31, 2010	$ 437,823	$ 118,296	$ 336,795	$ 1,252,438	$ (1,236,024)	$ (33,682)
Exercise of stock options and release of nonvested shares	520	191	522	0	(193)	0
Net tax effect of options exercised and release of nonvested shares	(959)	0	(959)	0	0	0
Stock-based compensation	4,988	0	4,988	0	0	0
Dividends paid ($0.320 per share and $0.170 per share at December 31, 2011 and at June 30, 2012 respectively)	(20,370)	0	0	(20,370)	0	0
Treasury stock issued	159	0	(197)	0	356	0
Purchase of treasury stock	(8,363)	0	0	0	(8,363)	0
Net income (loss)	44,198	0	0	44,198	0	0
Other comprehensive income or loss	(11,641)	0	0	0	0	(11,641)
Balance, ending at Dec. 31, 2011	446,355	118,487	341,149	1,276,266	(1,244,224)	(45,323)
Exercise of stock options and release of nonvested shares	300	205	274	0	(179)	0
Net tax effect of options exercised and release of nonvested shares	(1,105)	0	(1,105)	0	0	0
Stock-based compensation	2,196	0	2,196	0	0	0
Dividends paid ($0.320 per share and $0.170 per share at December 31, 2011 and at June 30, 2012 respectively)	(10,813)	0	0	(10,813)	0	0
Treasury stock issued	79	0	(116)	0	195	0
Net income (loss)	(102,912)	0	0	(102,912)	0	0
Other comprehensive income or loss	1,773	0	0	0	0	1,773
Balance, ending at Jun. 30, 2012	$ 335,873	$ 118,692	$ 342,398	$ 162,541	$ (1,244,208)	$ (43,550)