CONSOLIDATED STATEMENTS OF CHANGES IN TOTAL EQUITY - USD ($) $ in Thousands		Total	Common Shares	Capital in Excess of Stated Value	Accumulated Other Comprehensive Loss	Retained Earnings	Non- controlling Interests
Beginning Balance at Dec. 31, 2014		$ 1,503,847	$ 7,175	$ 396,980	$ (608,851)	$ 1,692,891	$ 15,652
Beginning Balance (in shares) at Dec. 31, 2014			100,603,000
Net income		250,624				250,136	488
Other comprehensive income/(loss):
Translation gain/(loss)		(129,652)			(125,534)		(4,118)
Defined benefit plan adjustment	[1]	31,042			31,042
Derivative financial instruments	[1]	810			810
Other comprehensive income/(loss)		(97,800)			(93,682)		(4,118)
Dividends		(139,200)				(139,200)
Issuance of stock awards		6,091		6,091
Issuance of stock awards (in shares)			514,000
Shares repurchased		(7,868)		(7,868)
Shares repurchased (in shares)			(173,000)
Stock-based compensation		9,257		9,257
Non-controlling interest from acquisition		7,922					7,922
Ending Balance at Dec. 31, 2015		1,532,873	$ 7,175	404,460	(702,533)	1,803,827	19,944
Ending Balance (in shares) at Dec. 31, 2015			100,944,000
Net income		287,881				286,434	1,447
Other comprehensive income/(loss):
Translation gain/(loss)		(32,405)			(33,361)		956
Defined benefit plan adjustment	[1]	(9,577)			(9,577)
Derivative financial instruments	[1]	7,091			7,091
Other comprehensive income/(loss)		(34,891)			(35,847)		956
Dividends		(147,748)				(147,748)
Issuance of stock awards		4,040		4,040
Issuance of stock awards (in shares)			428,000
Shares repurchased		(106,739)		(106,739)
Shares repurchased (in shares)			(2,179,000)
Stock-based compensation		19,289		19,289
Ending Balance at Dec. 31, 2016		$ 1,554,705	$ 7,175	321,050	(738,380)	1,942,513	22,347
Ending Balance (in shares) at Dec. 31, 2016		99,193,000	99,193,000
Net income		$ 177,447				175,345	2,102
Other comprehensive income/(loss):
Translation gain/(loss)		89,108			88,003		1,105
Defined benefit plan adjustment	[1]	59,924			59,924
Derivative financial instruments	[1]	(2,580)			(2,580)
Other comprehensive income/(loss)		146,452			145,347		1,105
Dividends		(154,773)				(154,773)
Issuance of stock awards		1,636		1,636
Issuance of stock awards (in shares)			341,000
Shares repurchased		(6,335)		(6,335)
Shares repurchased (in shares)			(120,000)
Stock-based compensation		13,488		13,488
Non-controlling interest from acquisition		(2,560)					(2,560)
Ending Balance at Dec. 31, 2017		$ 1,730,060	$ 7,175	330,157	(666,272)	2,036,006	$ 22,994
Ending Balance (in shares) at Dec. 31, 2017		99,414,000	99,414,000
Other comprehensive income/(loss):
Impact of new accounting pronouncements		$ 0		$ 318	$ (73,239)	$ 72,921

[1] net of tax