Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Property, Plant and Equipment [Table Text Block]

Classification	Expected Useful Life
Computer equipment	3 to 5 years
Production machinery and equipment	7 to 10 years
Buildings	25 years

PROPERTY, PLANT AND EQUIPMENT

December 31,	2015			2014
(Dollars in thousands)
Land and buildings	$	73,803		$	91,209
Machinery and equipment	486,612			447,880
Leasehold improvements and others	4,204			6,865
Construction in progress	20,455			59,600
	585,074			605,554
Accumulated depreciation	(350,428		)	(350,519		)
Property, plant and equipment, net	$	234,646		$	255,035

Pre-Production Costs and Deferred Revenue Related to Long-Term Supply Arrangements [Table Text Block]

The following tables summarize the unamortized customer-owned tooling costs included in our non-current other assets, and the deferred tooling revenues included in accrued liabilities and other non-current liabilities:

December 31,	2015			2014
(Dollars in Thousands)
Customer-Owned Tooling Costs
Preproduction costs	$	73,095		$	65,621
Accumulated amortization	(58,632		)	(53,408		)
Net preproduction costs	$	14,463		$	12,213
Deferred Tooling Revenue
Accrued expenses	$	2,908		$	4,833
Other non-current liabilities	1,266			2,449
Total deferred tooling revenue	$	4,174		$	7,282

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Year Ended December 31,	2015		2014		2013
(Thousands of dollars, except per share amounts)
Basic Earnings Per Share
Reported net income	$	23,944	$	8,803	$	22,824
Weighted average shares outstanding	26,599		26,908		27,392
Basic earnings per share	0.90		$	0.33	$	0.83
Diluted Earnings Per Share
Reported net income	$	23,944	$	8,803	$	22,824
Weighted average shares outstanding	26,599		26,908		27,392
Weighted average dilutive stock options	34		112		139
Weighted average shares outstanding - diluted	26,633		27,020		27,531
Diluted earnings per share	$	0.90	$	0.33	$	0.83