Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,283,904	$ 168,568	$ 671,206	$ 568,295	$ (124,165)
Shares issued	35,552	1,099	34,453	0	0
Stock compensation cost	12,312	0	12,312	0
Restricted stock canceled (issued)	(2,336)	0	(2,336)	0	0
Net Earnings	215,805	0	0	215,805	0
Dividends, Common Stock, Cash	(63,671)	0	0	(63,671)	0
Other comprehensive income (loss)	(303)	0	0	0	(303)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,382,502	169,413	702,829	642,259	(131,999)
Shares issued	9,092	254	8,838	0	0
Stock compensation cost	6,304	0	6,304	0
Restricted stock canceled (issued)	(2,336)	0	(2,336)	0	0
Net Earnings	110,118	0	0	110,118	0
Dividends, Common Stock, Cash	(31,948)	0	0	(31,948)	0
Other comprehensive income (loss)	7,531	0	0	0	7,531
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,481,263	169,667	715,635	720,429	(124,468)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,709,343	170,308	742,288	876,916	(80,169)
Shares issued	22,192	507	21,685
Shares repurchased	(120,021)	(1,701)	(7,412)	(110,908)
Stock compensation cost	13,649		13,649
Restricted stock canceled (issued)	(1)		(1)
Net Earnings	218,221			218,221
Dividends, Common Stock, Cash	(71,365)			(71,365)
Other comprehensive income (loss)	(14,744)				(14,744)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,690,256	169,223	761,959	841,503	(82,429)
Shares issued	2,117	70	2,047
Shares repurchased	(11,316)	(179)	(777)	(10,360)
Stock compensation cost	6,980		6,980
Restricted stock canceled (issued)	0		0
Net Earnings	117,378			117,378
Dividends, Common Stock, Cash	(35,657)			(35,657)
Other comprehensive income (loss)	(12,484)				(12,484)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,757,274	$ 169,114	$ 770,209	$ 912,864	$ (94,913)