Consolidated Stockholders' Equity Statements - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning balance, shares at Dec. 31, 2014		0	50,335
Beginning balance at Dec. 31, 2014	$ 807,186	$ 0	$ 503	$ 595,389	$ 621,896	$ (364,571)	$ (46,031)	$ 0
Beginning balance, Treasury shares at Dec. 31, 2014						(7,871)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Contribution from noncontrolling interest	1,470							1,470
Net income	66,180				66,204			(24)
Foreign currency translation gain (loss), net of $1.2 million, $1.3 million, and $1.8 million tax, respectively	(20,842)						(20,820)	(22)
Adjustments to pension and postretirement liability, net of $4.1 million, $3.1 million, and $3.6 million tax, respectively	7,864						7,864
Other comprehensive loss, net of tax	(12,978)
Exercise of stock options, net of tax withholding forfeitures	(6,166)			(6,070)		$ (96)
Exercise of stock options, net of tax withholding forfeitures, shares						100
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(5,527)			(6,454)		$ 927
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares						115
Share repurchase program, shares						(698)
Share repurchase program	(39,053)					$ (39,053)
Share-based compensation related items	22,795			22,795
Common stock dividends ($0.20 per share)	(8,384)				(8,384)
Ending balance, shares at Dec. 31, 2015		0	50,335
Ending balance at Dec. 31, 2015	825,523	$ 0	$ 503	605,660	679,716	$ (402,793)	(58,987)	1,424
Ending balance, Treasury shares at Dec. 31, 2015						(8,354)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	127,646				128,003			(357)
Foreign currency translation gain (loss), net of $1.2 million, $1.3 million, and $1.8 million tax, respectively	18,687						18,750	(63)
Adjustments to pension and postretirement liability, net of $4.1 million, $3.1 million, and $3.6 million tax, respectively	1,170						1,170
Other comprehensive loss, net of tax	19,857
Preferred stock issuance, net, shares		52
Preferred stock issuance, net	501,498	$ 1		501,497
Exercise of stock options, net of tax withholding forfeitures	(4,088)			(4,205)		$ 117
Exercise of stock options, net of tax withholding forfeitures, shares						76
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(3,390)			(5,040)		$ 1,650
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares						123
Share-based compensation related items	18,178			18,178
Preferred stock dividends	(15,428)				(15,428)
Common stock dividends ($0.20 per share)	(8,479)				(8,479)
Ending balance, shares at Dec. 31, 2016		52	50,335
Ending balance at Dec. 31, 2016	$ 1,461,317	$ 1	$ 503	1,116,090	783,812	$ (401,026)	(39,067)	1,004
Ending balance, Treasury shares at Dec. 31, 2016	(8,155)					(8,155)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 92,853				93,210			(357)
Foreign currency translation gain (loss), net of $1.2 million, $1.3 million, and $1.8 million tax, respectively	(65,046)						(65,030)	(16)
Adjustments to pension and postretirement liability, net of $4.1 million, $3.1 million, and $3.6 million tax, respectively	6,071						6,071
Other comprehensive loss, net of tax	(58,975)
Exercise of stock options, net of tax withholding forfeitures	(2,838)			(2,635)		$ (203)
Exercise of stock options, net of tax withholding forfeitures, shares						55
Conversion of restricted stock units into common stock, net of tax withholding forfeitures	(3,726)			(4,270)		$ 544
Conversion of restricted stock units into common stock, net of tax withholding forfeitures, shares						97
Share repurchase program, shares						(313)
Share repurchase program	(25,000)					$ (25,000)
Share-based compensation related items	14,647			14,647
Preferred stock dividends	(34,931)				(34,931)
Common stock dividends ($0.20 per share)	(8,481)				(8,481)
Ending balance, shares at Dec. 31, 2017		52	50,335
Ending balance at Dec. 31, 2017	$ 1,434,866	$ 1	$ 503	$ 1,123,832	$ 833,610	$ (425,685)	$ (98,026)	$ 631
Ending balance, Treasury shares at Dec. 31, 2017	(8,316)					(8,316)