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Revenue - Effects of Topic 606 on Financial Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 180,875 |  |  |  |  |  | $ 180,875 |  | $ 150,307 | $ 145,385 |
Costs in excess of billings | 21,522 |  |  |  |  |  | 21,522 |  | 16,532 | 16,532 |
Inventories | 97,486 |  |  |  |  |  | 97,486 |  | 81,637 | 86,372 |
Total current assets | 532,723 |  |  |  |  |  | 532,723 |  | 462,951 | 462,764 |
Total assets | 1,053,787 |  |  |  |  |  | 1,053,787 |  | 991,572 | 991,385 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 76,268 |  |  |  |  |  | 76,268 |  | 75,380 | 75,467 |
Total current liabilities | 191,565 |  |  |  |  |  | 191,565 |  | 170,946 | 171,033 |
Shareholders' equity |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 325,878 |  |  |  |  |  | 325,878 |  | 274,836 | 274,562 |
Total shareholders' equity | 582,875 | $ 560,896 | $ 541,955 | $ 505,431 | $ 481,903 | $ 466,305 | 582,875 | $ 505,431 | 531,993 | 531,719 | $ 460,880
Total liabilities and shareholders' equity | 1,053,787 |  |  |  |  |  | 1,053,787 |  | 991,572 | 991,385 |
Net sales: | 280,086 |  |  | 274,574 |  |  | 761,459 | 728,806 |  |  |
Cost of sales | 209,807 |  |  | 205,839 |  |  | 572,359 | 548,991 |  |  |
Gross profit | 70,279 |  |  | 68,735 |  |  | 189,100 | 179,815 |  |  |
Provision for income taxes | 6,473 |  |  | 11,184 |  |  | 15,574 | 21,090 |  |  |
Net income | 19,503 | $ 22,837 | $ 8,352 | $ 20,619 | $ 12,769 | $ 3,996 | 50,692 | $ 37,384 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 174,426 |  |  |  |  |  | 174,426 |  |  | 145,385 |
Costs in excess of billings |  |  |  |  |  |  |  |  |  | 11,610 |
Inventories | 102,662 |  |  |  |  |  | 102,662 |  |  | 86,372 |
Total current assets | 531,450 |  |  |  |  |  | 531,450 |  |  | 462,764 |
Total assets | 1,052,514 |  |  |  |  |  | 1,052,514 |  |  | 991,385 |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 75,889 |  |  |  |  |  | 75,889 |  |  | 75,467 |
Total current liabilities | 191,186 |  |  |  |  |  | 191,186 |  |  | 171,033 |
Shareholders' equity |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 324,984 |  |  |  |  |  | 324,984 |  |  | 274,562 |
Total shareholders' equity | 581,981 |  |  |  |  |  | 581,981 |  |  | 531,719 |
Total liabilities and shareholders' equity | 1,052,514 |  |  |  |  |  | 1,052,514 |  |  | $ 991,385 |
Net sales: | 281,156 |  |  |  |  |  | 760,277 |  |  |  |
Cost of sales | 210,878 |  |  |  |  |  | 572,039 |  |  |  |
Gross profit | 70,278 |  |  |  |  |  | 188,238 |  |  |  |
Provision for income taxes | 6,473 |  |  |  |  |  | 15,332 |  |  |  |
Net income | 19,502 |  |  |  |  |  | 50,072 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 6,449 |  |  |  |  |  | 6,449 |  | 4,922 |  |
Costs in excess of billings |  |  |  |  |  |  |  |  | 4,922 |  |
Inventories | (5,176) |  |  |  |  |  | (5,176) |  | (4,735) |  |
Total current assets | 1,273 |  |  |  |  |  | 1,273 |  | 187 |  |
Total assets | 1,273 |  |  |  |  |  | 1,273 |  | 187 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 379 |  |  |  |  |  | 379 |  | (87) |  |
Total current liabilities | 379 |  |  |  |  |  | 379 |  | (87) |  |
Shareholders' equity |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 894 |  |  |  |  |  | 894 |  | 274 |  |
Total shareholders' equity | 894 |  |  |  |  |  | 894 |  | 274 |  |
Total liabilities and shareholders' equity | 1,273 |  |  |  |  |  | 1,273 |  | $ 187 |  |
Net sales: | (1,070) |  |  |  |  |  | 1,182 |  |  |  |
Cost of sales | (1,071) |  |  |  |  |  | 320 |  |  |  |
Gross profit | 1 |  |  |  |  |  | 862 |  |  |  |
Provision for income taxes | 0 |  |  |  |  |  | 242 |  |  |  |
Net income | $ 1 |  |  |  |  |  | $ 620 |  |  |  |

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