CONSOLIDATED BALANCE SHEETS (Parentheticals) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Allowances for uncollectible accounts	$ 3,161	$ 4,816
Investments at fair value	1,868	2,091
Accumulated depreciation	349,856	344,785
Accumulated amortization	$ 451,214	$ 407,747
Shareholders' equity:
Common stock, par value (per share)	$ 1.00	$ 1.00
Common stock, shares authorized	500,000	500,000
Common stock, shares outstanding	48,586	49,019