Note 8. Related-party Transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Selling, general and administrative expenses	$ 9,877	[1]	$ 9,099	[2]	$ 26,887	[3]	$ 26,347	[4]
IHCAffiliatedEntityMember
Selling, general and administrative expenses	$ 273		$ 281		$ 862		$ 857

[1] $3,571 from related parties

[2] $3,071 from related parties

[3] $9,500 from related parties

[4] $8,954 from related parties