Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Earnings [Member]	Treasury Stock [Member]	Total
Beginning Balance at Dec. 31, 2011	$ 987	$ 1,117,093	$ 2,063,110	$ 33,800	$ (19,894)	$ 3,195,096
Beginning Balance (in shares) at Dec. 31, 2011	96,679,000
Net earnings	0	0	483,360	0	0	483,360
Stock option exercises	14	56,086	0	0	0	56,100
Stock option exercises (in shares)	1,389,000
Treasury stock sold	0	1,977	0	0	218	2,195
Treasury stock sold (in shares)	22,000
Currency translation adjustments, net of tax	0	0	0	23,633	0	23,633
Stock based compensation	0	39,808	0	0	0	39,808
Restricted stock activity	2	(18,424)	0	0	0	(18,422)
Restricted stock activity (in shares)	187,000
Stock option tax benefit, net of shortfalls	0	30,840	0	0	0	30,840
Conversion of senior subordinated convertible notes	3	(69,379)	0	0	0	(69,376)
Conversion of senior subordinated convertible notes (in shares)	327,000
Deferred Pension Gain	0	0	0	1,104	0	1,104
Dividends declared	0	0	(56,612)	0	0	(56,612)
Ending Balance at Dec. 31, 2012	1,006	1,158,001	2,489,858	58,537	(19,676)	3,687,726
Ending Balance (in shares) at Dec. 31, 2012	98,604,000
Net earnings	0	0	538,293	0	0	538,293
Stock option exercises	4	23,995	0	0	0	23,999
Stock option exercises (in shares)	434,000
Treasury stock sold	0	2,248	0	0	201	2,449
Treasury stock sold (in shares)	20,000
Currency translation adjustments, net of tax	0	0	0	(15,454)	0	(15,454)
Stock based compensation	0	53,417	0	0	0	53,417
Restricted stock activity	3	(16,046)	0	0	0	(16,043)
Restricted stock activity (in shares)	254,000
Stock option tax benefit, net of shortfalls	0	16,000	0	0	0	16,000
Conversion of senior subordinated convertible notes	0	(8,382)	0	0	0	(8,382)
Conversion of senior subordinated convertible notes (in shares)	0
Dividends declared	0	0	(68,955)	0	0	(68,955)
Ending Balance at Dec. 31, 2013	1,013	1,229,233	2,959,196	43,083	(19,475)	4,213,050
Ending Balance (in shares) at Dec. 31, 2013	99,312,000					99,312
Net earnings	0	0	646,033	0	0	646,033
Stock option exercises	6	32,517	0	0	0	32,523
Stock option exercises (in shares)	581,000
Treasury stock sold	0	2,549	0	0	202	2,751
Treasury stock sold (in shares)	20,000
Currency translation adjustments, net of tax	0	0	0	(115,010)	0	(115,010)
Stock based compensation	0	63,025	0	0	0	63,025
Restricted stock activity	2	(22,064)	0	0	0	(22,062)
Restricted stock activity (in shares)	213,000
Stock option tax benefit, net of shortfalls	0	21,481	0	0	0	21,481
Conversion of senior subordinated convertible notes	0	(1,403)	0	0	0	(1,403)
Dividends declared	0	0	(85,028)	0	0	(85,028)
Ending Balance at Dec. 31, 2014	$ 1,021	$ 1,325,338	$ 3,520,201	$ (71,927)	$ (19,273)	$ 4,755,360
Ending Balance (in shares) at Dec. 31, 2014	100,126,000					100,126