Note 9. Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning	$ (268,355)	$ (452,919)	$ (269,531)	$ (456,461)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	439	182	317	(258)
Other Comprehensive Income (Loss), before Tax	(439)	(182)	(317)	258
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	992	3,002	2,046	6,104
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending	(267,802)	(450,099)	(267,802)	(450,099)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning	(302)	(855)	(424)	(1,295)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	439	182	317	(258)
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment	0	0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending	(741)	(1,037)	(741)	(1,037)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning	(268,053)	(452,064)	(269,107)	(455,166)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax	0	0	0	0
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans	992	3,002	2,046	6,104
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending	$ (267,061)	$ (449,062)	$ (267,061)	$ (449,062)