CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net income	$ 138,573	$ 140,439	$ 111,770
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	124,032	109,094	100,535
Amortization of intangibles	14,056	13,566	13,892
Impairment charges	14,763	1,273	21,611
Share-based compensation expense	24,963	24,032	13,955
Equity in earnings, net of dividends related to earnings	(137)	(4,855)	(3,766)
Loss on refinancing and extinguishment of debt	1,020	5,104	0
Gain on divestitures and sale of investment in affiliate	0	0	(8,033)
Gain on remeasurement of previously held equity interest	0	0	(14,199)
Deferred income taxes	11,076	9,082	(2,698)
Other	1,286	1,591	725
Changes in operating assets and liabilities:
Accounts and tooling receivable	(26,428)	(579)	(72,546)
Inventories	(13,929)	6,651	12,848
Prepaid expenses	5,981	(7,010)	5,348
Accounts payable	11,415	70,066	61,063
Payroll and accrued liabilities	8,879	5,612	75,424
Other	(2,066)	(10,369)	(45,544)
Net cash provided by operating activities	313,484	363,697	270,385
Investing activities:
Capital expenditures	186,795	164,368	166,267
Proceeds from divestitures and sale of investment in affiliate	0	0	33,500
Acquisition of businesses, net of cash acquired	(478)	(37,478)	(34,396)
Investment in joint ventures	0	0	(4,300)
Cash from consolidation of joint venture	0	3,395	0
Other	(13,349)	185	5,069
Net cash used in investing activities	(200,622)	(198,266)	(166,394)
Financing activities:
Proceeds from issuance of long-term debt, net of debt issuance costs	0	393,060	0
Repayment and refinancing of term loan facility	0	(397,196)	0
Principal payments on long-term debt	(19,866)	(10,747)	(8,863)
Purchase of noncontrolling interest	0	0	(1,262)
Repurchase of common stock	(55,123)	(23,800)	0
Proceeds from exercise of warrants	2,373	2,810	9,277
Increase (decrease) in short term debt, net	10,683	(12,223)	(9,008)
Borrowings on long-term debt	0	0	151
Taxes withheld and paid on employees' share-based payment awards	(13,297)	(12,624)	(2,028)
Other	(297)	(2,196)	143
Net cash provided by (used in) financing activities	(75,527)	(62,916)	(11,590)
Effects of exchange rate changes on cash and cash equivalents	(1,475)	(666)	18,572
Changes in cash and cash equivalents	35,860	101,849	110,973
Cash and cash equivalents at beginning of period	480,092	378,243	267,270
Cash and cash equivalents at end of period	515,952	480,092	378,243
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	47,424	38,550	39,192
Cash paid for income taxes, net of refunds	$ 36,883	$ 38,334	$ 55,547