Note 9. Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning	$ (269,531)	$ (456,461)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	122	440
Other Comprehensive Income (Loss), before Tax	122	440
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	1,054	3,102
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending	(268,355)	(452,919)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning	(424)	(1,295)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	122	440
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending	(302)	(855)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning	(269,107)	(455,166)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax	0	0
Other Comprehensive Income (Loss), Amounts Reclassified from Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans	1,054	3,102
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending	$ (268,053)	$ (452,064)