Organization and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Inventories consisted of the following:



	As of December 31,
(Dollars in thousands)	2017		2016
Raw materials	$	43,092	$	29,788
Work-in-process	28,133		26,440
Finished goods	41,332		34,902
Total inventories	$	112,557	$	91,130

Schedule of property, plant and equipment, estimated useful lives

For financial reporting purposes, provisions for depreciation are calculated on a straight‑line basis over the following estimated useful lives of the underlying assets:



	Years
Buildings and improvements	30-40
Machinery and equipment	5-15
Office equipment	3-10



	As of December 31,
(Dollars in thousands)	2017			2016
Land	$	14,620		$	15,855
Buildings and improvements	135,191			138,493
Machinery and equipment	238,000			220,238
Office equipment	56,554			54,013
	444,365			428,599
Accumulated depreciation	(289,909		)	(259,178		)
Property, plant and equipment, net	154,456			169,421
Equipment in process	25,155			7,495
Total property, plant and equipment, net	$	179,611		$	176,916

Schedule of calculation of numerator and denominator in earnings per share

The following table sets forth the computation of basic and diluted earnings per share:



	Years Ended December 31,
(In thousands, except per share amounts)	2017		2016		2015
Numerator:
Net income	$	80,459	$	48,283	$	46,320
Denominator:
Weighted-average shares outstanding - basic	18,154		17,991		18,371
Effect of dilutive shares	393		232		309
Weighted-average shares outstanding - diluted	18,547		18,223		18,680
Basic earnings per share:	$	4.43	$	2.68	$	2.52
Diluted earnings per share:	$	4.34	$	2.65	$	2.48