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Stockholders' Equity (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ 218,453 | $ 193,304 | $ 171,557
Other comprehensive income (loss), before tax amount | (414) | (1,780) | 4,772
Other comprehensive income (loss), tax effect | 176 | (235) | 115
Other comprehensive income (loss) | (238) | (2,015) | 4,887
Balance at end of period | 241,752 | 218,453 | 193,304
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (37,465) | (35,450) | (40,337)
Other comprehensive income (loss) | (238) | (2,015) | 4,887
Balance at end of period | (37,703) | (37,465) | (35,450)
Pension and other postretirement actuarial items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (6,146) | (8,060) | (7,145)
Balance at end of period |  | (6,146) | (8,060)
Pension and other postretirement actuarial items, before reclassifications |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (6,686) | (8,498) |
Other comprehensive income (loss), before reclassifications, before tax amount | (1,310) | 1,392 | (1,465)
Other comprehensive income (loss), before reclassifications, tax | 194 | (18) | 112
Other comprehensive income (loss), before reclassifications, net of tax amount | (1,116) | 1,374 | (1,353)
Balance at end of period | (7,262) | (6,686) | (8,498)
Reclassification adjustment for recognition of actuarial items |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Reclassification adjustment, before tax amount | 359 | 685 | 583
Reclassification adjustment, tax effect | (39) | (145) | (145)
Reclassification adjustment, net of tax amount | 320 | 540 | 438
Foreign currency translation adjustment |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (31,319) | (27,390) | (33,192)
Other comprehensive income (loss), before reclassifications, before tax amount |  | (3,857) | 5,654
Other comprehensive income (loss), before reclassifications, tax |  | (72) | 148
Other comprehensive income (loss), before reclassifications, net of tax amount |  | (3,929) | 5,802
Reclassification adjustment, before tax amount | 827 |  |
Reclassification adjustment, tax effect | 0 |  |
Reclassification adjustment, net of tax amount | 827 |  |
Balance at end of period |  | $ (31,319) | $ (27,390)
Foreign currency translation adjustment, before reclassifications |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Other comprehensive income (loss), before reclassifications, before tax amount | (290) |  |
Other comprehensive income (loss), before reclassifications, tax | 21 |  |
Other comprehensive income (loss), before reclassifications, net of tax amount | (269) |  |
Balance at end of period | $ (31,588) |  |

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