CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in	Treasury Stock	Retained	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Balance beginning of period at Dec. 31, 2013	$ 1,586,991	$ 1,323	$ 415,059	$ (372,969)	$ 1,576,702	$ (34,856)	$ 1,732
Beginning Balance (in shares) at Dec. 31, 2013		132,349,534		36,439,586
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends ($ 0.20 in 2014, $0.28 in 2015 and $0.36 in 2016)	(19,246)				(19,246)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(17,461)		(9,997)	$ (7,464)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares)				711,247
Stock based compensation	23,475		23,475
Net income (loss)	351,680				351,680
Translation adjustment	(111,776)					(111,776)
Unrealized gain (loss) on foreign exchange contracts, net of tax ($31 in 2014, $14 in 2015 and $45 in 2016)	(23)					(23)
Unrealized gain (loss) on interest rate swap contracts, net of tax	210					210
Change in pension and post-retirement benefit plans, net of tax	12,621					12,621
Stock repurchase, shares (in shares)				(346,800)
Stock repurchase, value	(26,757)			$ (26,757)
Balance end of period at Dec. 31, 2014	1,808,974	$ 1,323	448,531	$ (392,262)	1,909,136	(159,486)	1,732
Ending Balance (in shares) at Dec. 31, 2014		132,349,534		36,075,139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends ($ 0.20 in 2014, $0.28 in 2015 and $0.36 in 2016)	(26,963)				(26,963)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	(2,007)		2,918	$ (4,925)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares)				450,738
Stock based compensation	23,713		23,713
Net income (loss)	398,628				398,628
Translation adjustment	(132,899)					(132,899)
Unrealized gain (loss) on foreign exchange contracts, net of tax ($31 in 2014, $14 in 2015 and $45 in 2016)	(66)					(66)
Unrealized gain (loss) on interest rate swap contracts, net of tax	(678)					(678)
Change in pension and post-retirement benefit plans, net of tax	16,410					16,410
Stock repurchase, shares (in shares)				(4,889,027)
Stock repurchase, value	(387,787)			$ (387,787)
Balance end of period at Dec. 31, 2015	1,701,339	$ 1,323	469,326	$ (775,124)	2,280,801	(276,719)	1,732
Ending Balance (in shares) at Dec. 31, 2015		132,349,534		40,513,428
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends ($ 0.20 in 2014, $0.28 in 2015 and $0.36 in 2016)	(32,430)				(32,430)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax	3,452		(8,490)	$ (5,038)
Proceeds from treasury stock issued from the exercise of stock options and other benefit plans, net of tax, shares (in shares)				328,245
Stock based compensation	17,748		17,748
Non-controlling interests associated with Faiveley Transport Acquisition	760,599						760,599
Net income (loss)	313,404				304,887		8,517
Translation adjustment	(93,684)					(93,684)
Unrealized gain (loss) on foreign exchange contracts, net of tax ($31 in 2014, $14 in 2015 and $45 in 2016)	(324)					(324)
Unrealized gain (loss) on interest rate swap contracts, net of tax	354					354
Change in pension and post-retirement benefit plans, net of tax	(9,232)					(9,232)
Stock issued for Faiveley Transport Acquisition	534,679		391,367	$ 143,312
Stock issued for Faiveley Transport Acquisition (in shares)				6,307,489
Stock repurchase, shares (in shares)				(3,046,408)
Stock repurchase, value	(212,176)			$ (212,176)
Balance end of period at Dec. 31, 2016	$ 2,976,825	$ 1,323	$ 869,951	$ (838,950)	$ 2,553,258	$ (379,605)	$ 770,848
Ending Balance (in shares) at Dec. 31, 2016		132,349,534		36,924,102