Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2010	$ 1,350,956	$ 1,060	$ 712,600	$ 1,538,325	$ (904,274)	$ 3,245
Balance, shares at Dec. 31, 2010		105,991
Net earnings	163,464			163,464
Other comprehensive income (loss)	(3,992)					(3,992)
Purchase of treasury stock	(164,285)		(116)		(164,169)
Exercise of stock options	34,910	17	34,893
Exercise of stock options, shares		1,809
Excess tax benefit related to stock awards	7,036		7,036
Stock-based compensation	4,471		4,471
Dividends declared	(36,357)			(36,357)
Other	(1,010)		(951)	(59)
Balance at Dec. 31, 2011	1,355,193	1,077	757,933	1,665,373	(1,068,443)	(747)
Balance, shares at Dec. 31, 2011		107,800
Net earnings	181,703			181,703
Other comprehensive income (loss)	2,775					2,775
Purchase of treasury stock	(61,860)		(35)		(61,825)
Exercise of stock options	14,120	7	14,113
Exercise of stock options, shares		604
Vesting of restricted share units	1	1
Vesting of restricted share units, shares		127
Excess tax benefit related to stock awards	4,348		4,348
Stock-based compensation	8,366		8,366
Dividends declared	(40,588)			(40,588)
Balance at Dec. 31, 2012	1,464,058	1,085	784,725	1,806,488	(1,130,268)	2,028
Balance, shares at Dec. 31, 2012		108,531
Net earnings	128,238			128,238
Other comprehensive income (loss)	(2,017)					(2,017)
Purchase of treasury stock	(217,421)		(12)		(217,409)
Exercise of stock options	11,932	5	11,927
Exercise of stock options, shares		479
Vesting of restricted share units	1	1
Vesting of restricted share units, shares		98
Excess tax benefit related to stock awards	(972)		(972)
Stock-based compensation	6,456		6,456
Dividends declared	(46,724)			(46,724)
Balance at Dec. 31, 2013	$ 1,343,551	$ 1,091	$ 802,124	$ 1,888,002	$ (1,347,677)	$ 11
Balance, shares at Dec. 31, 2013		109,108