Consolidated Condensed Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Condensed Statements Of Operations And Comprehensive Income
Revenues	$ 112,370	$ 128,978	$ 234,603	$ 234,396
Costs and expenses:
Cost of goods sold	85,906	97,295	179,054	182,789
Selling, general and administrative expenses	8,704	9,401	20,631	17,846
Total costs and expenses	94,610	106,696	199,685	200,635
Earnings from continuing operations before interest and taxes	17,760	22,282	34,918	33,761
Interest expense, net	(6,612)	(7,089)	(14,491)	(14,177)
Earnings from continuing operations before taxes	11,148	15,193	20,427	19,584
Income tax provision	(2,699)	(3,365)	(4,282)	(6,372)
Earnings from continuing operations	8,449	11,828	16,145	13,212
Discontinued operations, net of tax		(85)		(274)
Net earnings	8,449	11,743	16,145	12,938
Other comprehensive income, net of tax	843	450	1,840	7,075
Comprehensive income	$ 9,292	$ 12,193	$ 17,985	$ 20,013
Earnings per common share from continuing operations:
Basic	$ 0.21	$ 0.29	$ 0.40	$ 0.33
Diluted	$ 0.21	$ 0.29	$ 0.40	$ 0.33
Loss per common share from discontinued operations:
Basic				$ (0.01)
Diluted				$ (0.01)
Net earnings per common share:
Basic	$ 0.21	$ 0.29	$ 0.40	$ 0.32
Diluted	$ 0.21	$ 0.29	$ 0.40	$ 0.32
Distributions per common share	$ 0.51	$ 0.51	$ 1.02	$ 1.02
Average shares outstanding (in thousands):
Basic	40,174	39,972	40,127	39,930
Diluted	40,378	40,211	40,339	40,164