Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital In Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Stockholders' Equity	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018		125,871,866
Beginning balance at Dec. 31, 2018	$ 235,701	$ 1,259	$ 115,725	$ 1,166,762	$ (10,289)	$ (1,037,795)	$ 235,662	$ 39
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	49,110			48,978			48,978	132
Dividends declared	(16,323)			(16,323)			(16,323)
Currency translation adjustments	943				943		943
Derivative financial instruments	(582)				(582)		(582)
Defined benefit obligations	511				511		511
Available-for-sale investments	24				24		24
Exercises of stock options (in shares)		58,655
Exercises of stock options	1,276	$ 1	1,275				1,276
Shares placed in treasury	(29,027)		0			(29,027)	(29,027)
Stock-based compensation charges (in shares)		449,275
Stock-based compensation charges	2,529	$ 4	2,525				2,529
Distributions to noncontrolling interests	(146)							(146)
Ending balance (in shares) at Mar. 31, 2019		126,379,796
Ending balance at Mar. 31, 2019	$ 242,874	$ 1,264	119,525	1,198,198	(9,316)	(1,066,822)	242,849	25
Beginning balance (in shares) at Dec. 31, 2019	126,579,285	126,579,285
Beginning balance at Dec. 31, 2019	$ 404,112	$ 1,266	134,069	1,344,383	(7,448)	(1,068,164)	404,106	6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	75,620			75,499			75,499	121
Dividends declared	(18,254)			(18,254)			(18,254)
Currency translation adjustments	(11,940)				(11,940)		(11,940)
Derivative financial instruments	733				733		733
Defined benefit obligations	610				610		610
Available-for-sale investments	(600)				(600)		(600)
Exercises of stock options (in shares)		56,431
Exercises of stock options	1,332	$ 1	1,331				1,332
Shares placed in treasury	(25,076)					(25,076)	(25,076)
Stock-based compensation charges (in shares)		252,943
Stock-based compensation charges	3,102	$ 2	3,100				3,102
Distributions to noncontrolling interests	$ (127)							(127)
Ending balance (in shares) at Mar. 31, 2020	126,888,659	126,888,659
Ending balance at Mar. 31, 2020	$ 429,512	$ 1,269	$ 138,500	$ 1,401,628	$ (18,645)	$ (1,093,240)	$ 429,512	$ 0