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Revenue from Contracts with Customers - Impact of Adoption of New Accounting Principle (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Condensed Consolidated Statements of Financial Position: |  |  |  |  |  |
Inventory | $ 117,739 |  | $ 117,739 |  |  | $ 112,557
Retained earnings | 732,217 |  | 732,217 |  |  | 684,540
Condensed Consolidated Statement of Income |  |  |  |  |  |
Net sales | 214,675 | $ 201,424 | 429,286 | $ 405,252 |  |
Cost of sales | 138,003 | 120,878 | 276,007 | 244,356 |  |
Income tax expense | 8,373 | 10,697 | 13,144 | 23,583 |  |
Net income | $ 17,329 | $ 20,896 | $ 43,465 | $ 47,928 |  |
Basic earnings per share (in dollars per share) | $ 0.94 | $ 1.15 | $ 2.37 | $ 2.65 |  |
Diluted earnings per share (in dollars per share) | $ 0.93 | $ 1.13 | $ 2.33 | $ 2.60 |  |
Condensed Consolidated Statement of Cash Flows: |  |  |  |  |  |
Deferred income taxes |  |  | $ 3,879 | $ 4,813 |  |
Contract assets |  |  | (21,933) | 0 |  |
Inventories |  |  | (6,489) | (6,464) |  |
Other, net |  |  | 3,287 | 1,703 |  |
Net cash provided by operating activities |  |  | 22,818 | $ 64,489 |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
Condensed Consolidated Statements of Financial Position: |  |  |  |  |  |
Contract assets | $ 21,933 |  | 21,933 |  | $ 18,099 |
Inventory | 117,739 |  | 117,739 |  | 100,250 |
Deferred income taxes | 3,501 |  | 3,501 |  | 12,286 |
Retained earnings | 732,217 |  | 732,217 |  | 688,752 |
Under ASC 605 |  |  |  |  |  |
Condensed Consolidated Statement of Income |  |  |  |  |  |
Net sales | 214,782 |  | 425,452 |  |  |
Cost of sales | 138,076 |  | 273,400 |  |  |
Income tax expense | 8,373 |  | 12,811 |  |  |
Net income | $ 17,363 |  | $ 42,571 |  |  |
Basic earnings per share (in dollars per share) | $ 0.94 |  | $ 2.32 |  |  |
Diluted earnings per share (in dollars per share) | $ 0.93 |  | $ 2.28 |  |  |
Condensed Consolidated Statement of Cash Flows: |  |  |  |  |  |
Deferred income taxes |  |  | $ 3,546 |  |  |
Contract assets |  |  | 0 |  |  |
Inventories |  |  | (21,403) |  |  |
Other, net |  |  | (2,505) |  |  |
Net cash provided by operating activities |  |  | 22,818 |  |  |
Under ASC 605 | Accounting Standards Update 2014-09 |  |  |  |  |  |
Condensed Consolidated Statements of Financial Position: |  |  |  |  |  |
Contract assets | $ 0 |  | 0 |  |  | 0
Inventory | 132,653 |  | 132,653 |  |  | 112,557
Deferred income taxes | 1,588 |  | 1,588 |  |  | 10,706
Retained earnings | 727,111 |  | 727,111 |  |  | $ 684,540
Impact of Adoption |  |  |  |  |  |
Condensed Consolidated Statement of Income |  |  |  |  |  |
Net sales | (107) |  | 3,834 |  |  |
Cost of sales | (73) |  | 2,607 |  |  |
Income tax expense | 0 |  | 333 |  |  |
Net income | $ (34) |  | $ 894 |  |  |
Basic earnings per share (in dollars per share) | $ 0.00 |  | $ 0.05 |  |  |
Diluted earnings per share (in dollars per share) | $ 0.00 |  | $ 0.05 |  |  |
Condensed Consolidated Statement of Cash Flows: |  |  |  |  |  |
Deferred income taxes |  |  | $ 333 |  |  |
Contract assets |  |  | (21,933) |  |  |
Inventories |  |  | 14,914 |  |  |
Other, net |  |  | 5,792 |  |  |
Net cash provided by operating activities |  |  | 0 |  |  |
Impact of Adoption | Accounting Standards Update 2014-09 |  |  |  |  |  |
Condensed Consolidated Statements of Financial Position: |  |  |  |  |  |
Contract assets | $ 21,933 |  | 21,933 |  | 18,099 |
Inventory | (14,914) |  | (14,914) |  | (12,307) |
Deferred income taxes | 1,913 |  | 1,913 |  | 1,580 |
Retained earnings | $ 5,106 |  | $ 5,106 |  | $ 4,212 |

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