Consolidated Statement of Equity (USD $) In Thousands	Common Stock [Member]	Capital in 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, 2010	$ 69,223	$ 664,369	$ 452,470	$ (12,307)	$ 499	$ 572	$ 1,174,826
Net income			67,941			9	67,950
Unrealized holding gain on investments, net of income tax of $52					96		96
Reclassification adjustment for gains reported in net income, net of income tax of $39					(73)		(73)
Dividends paid			(42,813)				(42,813)
Sale of stock (299,441 shares)	143	5,920		325			6,388
Repurchase of stock (44,014 shares)				(998)			(998)
Equity compensation plan forfeitures (14,716 shares)	7	(7)
Exercise of stock options (357,703 shares)	179	5,388					5,567
Stock-based compensation		1,727	(24)				1,703
Employee stock plan tax benefits		(509)					(509)
Balance at Jun. 30, 2011	$ 69,552	$ 676,888	$ 477,574	$ (12,980)	$ 522	$ 581	$ 1,212,137

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