Consolidated Statement Of Equity (USD $) In Thousands	Common Stock [Member]	Capital Excess Of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2013	$ 88,964	$ 743,335	$ 729,272	$ (27,082)	$ 346	$ 208	$ 1,535,043
Net income			166,424			19	166,443
Other comprehensive income, net of income tax of $207					385		385
Dividends			(82,953)				(82,953)
Repurchase of stock (584,853 shares)				(13,973)			(13,973)
Equity compensation plan (212,920 shares)	107	(107)
Exercise of stock options (320,769 shares)	160	4,710					4,870
Stock-based compensation		5,137	(331)				4,806
Employee stock plan tax benefits		1,319					1,319
Other		(580)					(580)
Balance at Sep. 30, 2014	$ 89,231	$ 753,814	$ 812,412	$ (41,055)	$ 731	$ 227	$ 1,615,360