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Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Schedule of Change in Accounting Estimate | The following table summarizes the effect of this accounting change on the Company’s consolidated statements of operations for each of the two years ended December 31, 2014 and 2013:
(Dollars in thousands, except per share amounts) |  | As Originally Reported under LIFO |  | As Adjusted under FIFO |  | Effect of Change
2013 |  |  |  |  |  |
Cost of Sales |  | $ | 349,782 |  |  | $ | 348,945 |  |  | $ | (837 | )
Income from continuing operations |  | $ | 37,659 |  |  | $ | 38,203 |  |  | $ | 544 |
Net income |  | $ | 37,761 |  |  | $ | 38,305 |  |  | $ | 544 |
Basic earnings per share |  | $ | 2.20 |  |  | $ | 2.23 |  |  | $ | 0.03 |
Diluted earnings per share |  | $ | 2.13 |  |  | $ | 2.16 |  |  | $ | 0.03 |
2014 |  |  |  |  |  |
Cost of Sales |  | $ | 376,972 |  |  | $ | 376,158 |  |  | $ | (814 | )
Income from continuing operations |  | $ | 52,883 |  |  | $ | 53,412 |  |  | $ | 529 |
Net income |  | $ | 52,883 |  |  | $ | 53,412 |  |  | $ | 529 |
Basic earnings per share |  | $ | 2.91 |  |  | $ | 2.94 |  |  | $ | 0.03 |
Diluted earnings per share |  | $ | 2.83 |  |  | $ | 2.86 |  |  | $ | 0.03 |
Schedule of inventory | Inventories consisted of the following:
(Dollars in thousands) | December 31, 2015 |  | December 31, 2014 (1)
Raw materials | $ | 35,499 |  |  | $ | 29,980 |
Work-in-process | 22,804 |  |  | 18,537 |
Finished goods | 33,521 |  |  | 28,289 |
Total Inventory | $ | 91,824 |  |  | $ | 76,806 |
(1) Inventory amounts have been adjusted for the 2015 conversion from LIFO to FIFO as discussed above.
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
(Dollars in thousands) | December 31, 2015 |  | December 31, 2014
Land | $ | 16,726 |  |  | $ | 14,045 |
Buildings and improvements | 141,082 |  |  | 132,105 |
Machinery and equipment | 191,459 |  |  | 165,979 |
Office equipment | 42,696 |  |  | 36,810 |
| 391,963 |  |  | 348,939 |
Accumulated depreciation | (237,150 | ) |  | (225,092 | )
Property, plant and equipment, net | 154,813 |  |  | 123,847 |
Equipment in process | 23,848 |  |  | 26,573 |
Total property, plant and equipment, net | $ | 178,661 |  |  | $ | 150,420 |
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:
(In thousands, except per share amounts) | 2015 |  | 2014 |  | 2013
Numerator: |  |  |  |  |
Net income from continuing operations | $ | 46,320 |  |  | $ | 53,412 |  |  | $ | 38,203 |
Denominator: |  |  |  |  |
Weighted-average shares outstanding - basic | 18,371 |  |  | 18,177 |  |  | 17,198 |
Effect of dilutive shares | 309 |  |  | 521 |  |  | 570 |
Weighted-average shares outstanding - diluted | 18,680 |  |  | 18,698 |  |  | 17,768 |
Basic income from continuing operations per share: | $ | 2.52 |  |  | $ | 2.94 |  |  | $ | 2.22 |
Diluted income from continuing operations per share: | $ | 2.48 |  |  | $ | 2.86 |  |  | $ | 2.15 |

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