Other Comprehensive Income (Details Textual) (Reclassification out of Accumulated Other Comprehensive Income [Member], Accumulated Defined Benefit Plans Adjustment [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Cost of goods sold [Member]
Other Comprehensive Income (Textual) [Abstract]
Actuarial loss reclassified to net pension expense on consolidated statements of earning	$ 1,504
Research and development expenses [Member]
Other Comprehensive Income (Textual) [Abstract]
Actuarial loss reclassified to net pension expense on consolidated statements of earning	819
Selling, general and administrative expenses [Member]
Other Comprehensive Income (Textual) [Abstract]
Actuarial loss reclassified to net pension expense on consolidated statements of earning	$ 2,015