Consolidated Statements of Shareholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Class A Common Shares	Class B Common Shares	Treasury Stock	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock	Other Additional Capital [Member]	AOCI Attributable to Parent [Member]
Common Stock, Shares, Outstanding		72,294	7,733	13,091
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 955,251				$ 961,245	$ 354,979	$ (325,906)	$ (24,993)	$ (10,074)
Net income	$ 24,297					24,297
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	176
Stock Issued During Period, Value, Stock Options Exercised	$ 4,378				4,378
Dividends	(19,934)					(19,934)
Other Comprehensive Income (Loss), Net of Tax	(3,124)								(3,124)
Common Stock, Shares, Outstanding		72,470	7,733	13,091
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	960,868				965,623	359,342	(325,906)	(24,993)	(13,198)
Common Stock, Shares, Outstanding		70,672	7,733	15,091
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	832,377				978,794	254,718	(373,436)	(24,993)	(2,706)
Impact of Restatement on Opening Retained Earnings, Net of Tax	(9,556)					(9,556)
Net income	$ 31,194					31,194
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	172
Stock Issued During Period, Value, Stock Options Exercised	$ 3,299				3,299
Stock Repurchased During Period, Shares	(3,400)	(3,410)
Treasury Stock, Shares, Acquired				3,410
Stock Repurchased During Period, Value	$ (75,000)						(75,000)
Dividends	(18,903)					(18,903)
Other Comprehensive Income (Loss), Net of Tax	(560)								(560)
Common Stock, Shares, Outstanding		67,434	7,733	18,501
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	762,851				$ 982,093	$ 257,453	$ (448,436)	$ (24,993)	$ (3,266)
Impact of Restatement on Opening Retained Earnings, Net of Tax	$ (9,600)