Note 6. Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land	$ 160,219	$ 160,328
Buildings	156,168	156,723
Land and leasehold improvements	164,287	163,817
Equipment	201,452	200,214
Construction in progress	1,695	1,539
Property and equipment, gross	683,821	682,621
Less accumulated depreciation and amortization	(374,244)	(370,357)
Property and equipment, net	$ 309,577	$ 312,264