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Revenue - Effects of Topic 606 on Financial Statements (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Assets |  |  |  |
Accounts receivable, net | $ 145,182 |  | $ 150,307 | $ 145,385
Costs in excess of billings | 22,214 |  | 16,532 | 16,532
Inventories | 90,236 |  | 81,637 | 86,372
Total current assets | 442,871 |  | 462,951 | 462,764
Total assets | 967,143 |  | 991,572 | 991,385
Liabilities |  |  |  |
Accrued expenses | 53,254 |  | 75,380 | 75,467
Total current liabilities | 145,917 |  | 170,946 | 171,033
Shareholders' equity |  |  |  |
Retained earnings | 283,538 |  | 274,836 | 274,562
Total shareholders' equity | 541,955 |  | 531,993 | 531,719
Total liabilities and shareholders' equity | 967,143 |  | 991,572 | 991,385
Net sales: | 215,337 | $ 206,605 |  |
Cost of sales | 167,019 | 157,350 |  |
Gross profit | 48,318 | 49,255 |  |
Provision for income taxes | 2,807 | 2,053 |  |
Net income | 8,352 | $ 3,996 |  |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Assets |  |  |  |
Accounts receivable, net | 138,183 |  |  | 145,385
Costs in excess of billings |  |  |  | 11,610
Inventories | 96,371 |  |  | 86,372
Total current assets | 442,007 |  |  | 462,764
Total assets | 966,279 |  |  | 991,385
Liabilities |  |  |  |
Accrued expenses | 53,044 |  |  | 75,467
Total current liabilities | 145,707 |  |  | 171,033
Shareholders' equity |  |  |  |
Retained earnings | 282,884 |  |  | 274,562
Total shareholders' equity | 541,301 |  |  | 531,719
Total liabilities and shareholders' equity | 966,279 |  |  | $ 991,385
Net sales: | 213,369 |  |  |
Cost of sales | 165,580 |  |  |
Gross profit | 47,789 |  |  |
Provision for income taxes | 2,658 |  |  |
Net income | 7,972 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Assets |  |  |  |
Accounts receivable, net | 6,999 |  | 4,922 |
Costs in excess of billings |  |  | 4,922 |
Inventories | (6,135) |  | (4,735) |
Total current assets | 864 |  | 187 |
Total assets | 864 |  | 187 |
Liabilities |  |  |  |
Accrued expenses | 210 |  | (87) |
Total current liabilities | 210 |  | (87) |
Shareholders' equity |  |  |  |
Retained earnings | 654 |  | 274 |
Total shareholders' equity | 654 |  | 274 |
Total liabilities and shareholders' equity | 864 |  | $ 187 |
Net sales: | 1,968 |  |  |
Cost of sales | 1,439 |  |  |
Gross profit | 529 |  |  |
Provision for income taxes | 149 |  |  |
Net income | $ 380 |  |  |

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