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Business Segments and Geographic Information - Schedule of Information on Company's Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 614,822 | $ 581,113 | $ 561,249 | $ 594,462 | $ 605,997 | $ 624,246 | $ 642,099 | $ 622,231 | $ 2,351,646 | $ 2,494,573 | $ 2,483,666
Total operating income | 138,965 | $ 131,213 | $ 110,594 | $ 139,941 | 134,173 | $ 141,765 | $ 155,283 | $ 147,782 | 520,713 | 579,003 | 569,088
Interest expense |  |  |  |  |  |  |  |  | 44,746 | 44,341 | 44,134
Other (income) expense - net |  |  |  |  |  |  |  |  | 5,627 | 1,759 | (3,985)
Income before taxes |  |  |  |  |  |  |  |  | 470,340 | 532,903 | 528,939
Total assets | 4,414,398 |  |  |  | 3,813,912 |  |  |  | 4,414,398 | 3,813,912 | 3,473,857
Depreciation and Amortization |  |  |  |  |  |  |  |  | 83,495 | 76,876 | 77,544
Total capital expenditures |  |  |  |  |  |  |  |  | 51,545 | 50,912 | 56,089
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | (3,471) | (3,671) | (1,333)
Corporate office and other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income |  |  |  |  |  |  |  |  | (64,845) | (71,711) | (80,252)
Total assets | 559,374 |  |  |  | 330,694 |  |  |  | 559,374 | 330,694 | 230,637
Depreciation and Amortization |  |  |  |  |  |  |  |  | 562 | 670 | 742
Total capital expenditures |  |  |  |  |  |  |  |  | 3,082 | 1,815 | 191
FMT |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 895,474 | 956,523 | 951,275
Total operating income |  |  |  |  |  |  |  |  | 235,011 | 285,256 | 275,060
Total assets | 1,387,067 |  |  |  | 1,150,712 |  |  |  | 1,387,067 | 1,150,712 | 1,107,777
Depreciation and Amortization |  |  |  |  |  |  |  |  | 25,939 | 22,152 | 22,370
Total capital expenditures |  |  |  |  |  |  |  |  | 11,924 | 17,285 | 19,541
FMT | Intersegment elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 830 | 505 | 277
FMT | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 896,304 | 957,028 | 951,552
HST |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 893,353 | 912,623 | 895,970
Total operating income |  |  |  |  |  |  |  |  | 206,356 | 200,200 | 205,679
Total assets | 1,576,093 |  |  |  | 1,507,108 |  |  |  | 1,576,093 | 1,507,108 | 1,329,368
Depreciation and Amortization |  |  |  |  |  |  |  |  | 41,778 | 39,721 | 39,939
Total capital expenditures |  |  |  |  |  |  |  |  | 27,626 | 22,001 | 26,039
HST | Intersegment elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 2,609 | 1,823 | 449
HST | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 895,962 | 914,446 | 896,419
FSDP |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 562,819 | 625,427 | 636,421
Total operating income |  |  |  |  |  |  |  |  | 144,191 | 165,258 | 168,601
Total assets | $ 891,864 |  |  |  | $ 825,398 |  |  |  | 891,864 | 825,398 | 806,075
Depreciation and Amortization |  |  |  |  |  |  |  |  | 15,216 | 14,333 | 14,493
Total capital expenditures |  |  |  |  |  |  |  |  | 8,913 | 9,811 | 10,318
FSDP | Intersegment elimination |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 32 | 1,343 | 607
FSDP | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 562,851 | $ 626,770 | $ 637,028

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