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Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of inventory | 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 |

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