CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common and Class B Common Stock ($1 par value)	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained Earnings	Treasury stock	Noncontrolling interests
Beginning balance at Dec. 31, 2013	$ 663,089	$ 22,853	$ 171,915	$ 10,882	$ 452,314	$ (2,666)	$ 7,791
Increase (Decrease) in Stockholders' Equity
Net income (loss)	29,753				29,753
Cash dividends on Common Stock	(2,334)				(2,334)
Cash paid on Class B Common Shares conversion	0
Stock bonuses and other	3,916	77	3,839
Exercise of stock options	58	2	56
Stock repurchases	(22,048)	(685)	(21,363)
Conversion of Convertible Senior Notes for Common Stock	27,190	2,111	25,079
Purchase of remaining interest of consolidated subsidiary	(321)		(321)
Net change in unrealized gains and losses on investments (net of tax)	9,793			9,793
Net realized gain reclassification (net of tax)	(555)			(555)
Foreign currency translation (net of tax)	(7,565)			(7,565)
Net income attributable to noncontrolling interests	8,556						8,556
Distributions to noncontrolling interests	(8,986)						(8,986)
Net effect of changes in ownership and other	(93)						(93)
Ending balance at Dec. 31, 2014	700,453	24,358	179,205	12,555	479,733	(2,666)	7,268
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(6,204)				(6,204)
Cash dividends on Common Stock	(18,010)				(18,010)
Cash paid on Class B Common Shares conversion	0
Stock bonuses and other	4,851	93	4,758
Exercise of stock options	130	4	126
Stock repurchases	(27,950)	(762)	(27,188)
Purchase of remaining interest of consolidated subsidiary	(209)		(209)
Net change in unrealized gains and losses on investments (net of tax)	(3,741)			(3,741)
Net realized gain reclassification (net of tax)	(1,626)			(1,626)
Foreign currency translation (net of tax)	(11,145)			(11,145)
Net income attributable to noncontrolling interests	10,247						10,247
Distributions to noncontrolling interests	(9,706)						(9,706)
Net effect of changes in ownership and other	38						38
Ending balance at Dec. 31, 2015	637,128	23,693	156,692	(3,957)	455,519	(2,666)	7,847
Increase (Decrease) in Stockholders' Equity
Cumulative effect adjustment for adoption of new accounting pronouncement	0		(631)		631
Net income (loss)	55,478				55,478
Cash dividends on Common Stock	(27,840)				(27,840)
Cash paid on Class B Common Shares conversion	(12,000)				(12,000)
Stock bonuses and other	2,982	110	2,872
Exercise of stock options	86	3	83
Stock repurchases	(1,053)	(23)	(1,030)
Purchase of remaining interest of consolidated subsidiary	(991)		(810)				(181)
Net change in unrealized gains and losses on investments (net of tax)	354			354
Net realized gain reclassification (net of tax)	(1,911)			(1,911)
Foreign currency translation (net of tax)	(3,367)			(3,367)
Net income attributable to noncontrolling interests	12,943						12,943
Distributions to noncontrolling interests	(12,961)						(12,961)
Ending balance at Dec. 31, 2016	$ 648,848	$ 23,783	$ 157,176	$ (8,881)	$ 471,788	$ (2,666)	$ 7,648