Net Earnings (Loss) Per Common Share Computation of Basic and Diluted Net Earnings (Loss) Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Basic
Average common shares outstanding	31,902	31,819
Net Earnings (loss)	$ 35,181	$ 8,233
Net earnings (loss) per common share	$ 1.10	$ 0.26
Income (Loss) from Continuing Operations Attributable to Parent	(4,533)	5,605
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	39,714	2,628
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.14)	$ 0.18
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share	$ 1.24	$ 0.08
Diluted
Average common shares outstanding	31,902	31,819
Shares related to convertible debt	0	0
Stock options and awards	32	3
Average common shares assuming dilution	31,934	31,822
Net Earnings (loss)	$ 35,181	$ 8,233
Net Earnings (loss) per Share - Assuming Dilution	$ 1.10	$ 0.26
Income (Loss) from Continuing Operations, Per Diluted Share	$ (0.14)	$ 0.18
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 1.24	$ 0.08