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Revenue from Contracts with Customers (Impact of Adoption of Accounting Principles) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Consolidated Statements of Financial Position: |  |  |  |  |  |  |  |  |  |  |  |
Contract assets | $ 22,728 |  |  |  | $ 0 |  |  |  | $ 22,728 | $ 0 |  |
Inventories | 132,637 |  |  |  | 112,557 |  |  |  | 132,637 | 112,557 |  |
Deferred income taxes | 10,806 |  |  |  |  |  |  |  | 10,806 |  |  |
Retained earnings | 776,403 |  |  |  | 684,540 |  |  |  | 776,403 | 684,540 |  |
Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |  |
Net sales | 222,942 | $ 226,863 | $ 214,675 | $ 214,611 | 209,008 | $ 206,783 | $ 201,424 | $ 203,828 | 879,091 | 821,043 | $ 656,314 |
Cost of sales |  |  |  |  |  |  |  |  | 568,308 | 502,468 | 406,829 |
Income tax expense |  |  |  |  |  |  |  |  | 22,938 | 52,466 | 33,997 |
Net income |  |  |  |  |  |  |  |  | $ 87,651 | $ 80,459 | $ 48,283 |
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.77 | $ 4.43 | $ 2.68 |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.70 | $ 4.34 | $ 2.65 |
Consolidated Statements of Cash Flows: |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  | $ (3,325) | $ 17,513 | $ 7,382 |
Contract assets |  |  |  |  |  |  |  |  | (22,728) | 0 | 0 |
Inventories |  |  |  |  |  |  |  |  | (19,013) | (14,208) | 9,689 |
Other, net |  |  |  |  |  |  |  |  | 991 | 5,885 | (4,715) |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 66,820 | 138,982 | $ 116,967 |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Financial Position: |  |  |  |  |  |  |  |  |  |  |  |
Contract assets |  |  |  |  |  |  |  |  |  |  |  | $ 18,099
Inventories |  |  |  |  |  |  |  |  |  |  |  | 100,250
Deferred income taxes |  |  |  |  |  |  |  |  |  |  |  | 12,286
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 688,752
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Financial Position: |  |  |  |  |  |  |  |  |  |  |  |
Contract assets | 0 |  |  |  |  |  |  |  | 0 |  |  |
Inventories | 148,092 |  |  |  |  |  |  |  | 148,092 |  |  |
Deferred income taxes | 8,846 |  |  |  |  |  |  |  | 8,846 |  |  |
Retained earnings | 771,090 |  |  |  |  |  |  |  | 771,090 |  |  |
Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 874,462 |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 565,160 |  |  |
Income tax expense |  |  |  |  |  |  |  |  | 22,558 |  |  |
Net income |  |  |  |  |  |  |  |  | $ 86,550 |  |  |
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.71 |  |  |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 4.64 |  |  |
Consolidated Statements of Cash Flows: |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  | $ (3,705) |  |  |
Contract assets |  |  |  |  |  |  |  |  | 0 |  |  |
Inventories |  |  |  |  |  |  |  |  | (34,468) |  |  |
Other, net |  |  |  |  |  |  |  |  | (4,801) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 66,820 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Financial Position: |  |  |  |  |  |  |  |  |  |  |  |
Contract assets |  |  |  |  | 0 |  |  |  |  | 0 |  |
Inventories |  |  |  |  | 112,557 |  |  |  |  | 112,557 |  |
Deferred income taxes |  |  |  |  | 10,706 |  |  |  |  | 10,706 |  |
Retained earnings |  |  |  |  | $ 684,540 |  |  |  |  | $ 684,540 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Financial Position: |  |  |  |  |  |  |  |  |  |  |  |
Contract assets | 22,728 |  |  |  |  |  |  |  | 22,728 |  |  | 18,099
Inventories | (15,455) |  |  |  |  |  |  |  | (15,455) |  |  | (12,307)
Deferred income taxes | 1,960 |  |  |  |  |  |  |  | 1,960 |  |  | 1,580
Retained earnings | $ 5,313 |  |  |  |  |  |  |  | 5,313 |  |  | $ 4,212
Consolidated Statements of Operations: |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,629 |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 3,148 |  |  |
Income tax expense |  |  |  |  |  |  |  |  | 380 |  |  |
Net income |  |  |  |  |  |  |  |  | $ 1,101 |  |  |
Basic earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.06 |  |  |
Diluted earnings per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.06 |  |  |
Consolidated Statements of Cash Flows: |  |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  | $ 380 |  |  |
Contract assets |  |  |  |  |  |  |  |  | (22,728) |  |  |
Inventories |  |  |  |  |  |  |  |  | 15,455 |  |  |
Other, net |  |  |  |  |  |  |  |  | 5,792 |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | $ 0 |  |  |

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