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Nature of Business and Basis of Presentation - ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Receivables, net |  |  |  |  | $ 56,250 |
Unbilled receivables, net | $ 35,771 |  | $ 35,771 |  | 47,069 | $ 42,577
Inventories, net | 166,486 |  | 166,486 |  | 130,038 | 132,591
Accounts payable | 48,219 |  | 48,219 |  | 65,517 | 66,015
Accrued expenses and other current liabilities | 36,282 |  | 36,282 |  | 40,898 | 40,243
Deferred tax liabilities | 18,337 |  | 18,337 |  | 20,000 | 19,423
Retained earnings | 292,930 |  | 292,930 |  | 269,597 | 267,902
Revenues | 168,931 | $ 174,164 | 516,222 | $ 565,318 |  |
Provision for income taxes | 3,323 | 3,251 | 8,611 | 12,541 |  |
Net income | 10,034 | 6,639 | 25,837 | 21,739 |  |
Products |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Revenues | 85,886 | 82,314 | 264,678 | 260,585 |  |
Costs and expenses | 72,256 | 68,678 | 222,816 | 217,606 |  |
Services |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Revenues | 83,045 | 91,850 | 251,544 | 304,733 |  |
Costs and expenses | 77,810 | $ 88,989 | 239,536 | $ 293,083 |  |
Without Adoption of ASC 606 |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Receivables, net |  |  |  |  |  | 55,760
Unbilled receivables, net | 29,341 |  | 29,341 |  |  | 42,577
Inventories, net | 170,221 |  | 170,221 |  |  | 132,591
Accounts payable |  |  |  |  |  | 66,015
Accrued expenses and other current liabilities | 36,282 |  | 36,282 |  |  | 40,243
Deferred tax liabilities | 17,574 |  | 17,574 |  |  | 19,423
Retained earnings | 290,998 |  | 290,998 |  |  | $ 267,902
Accounting Standards Update 2014-09 | Effect of ASC 606 Increase/(Decrease) |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Receivables, net |  |  |  |  | 490 |
Unbilled receivables, net |  |  |  |  | 4,492 |
Inventories, net |  |  |  |  | (2,553) |
Accounts payable |  |  |  |  | (498) |
Accrued expenses and other current liabilities |  |  |  |  | 655 |
Deferred tax liabilities |  |  |  |  | 577 |
Retained earnings |  |  |  |  | $ 1,695 |
Provision for income taxes | 3,345 |  | 8,425 |  |  |
Net income | 10,099 |  | 25,290 |  |  |
Accounting Standards Update 2014-09 | Effect of ASC 606 Increase/(Decrease) | Products |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Revenues | 85,625 |  | 263,094 |  |  |
Costs and expenses | 72,089 |  | 221,634 |  |  |
Accounting Standards Update 2014-09 | Effect of ASC 606 Increase/(Decrease) | Services |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Revenues | 83,227 |  | 251,213 |  |  |
Costs and expenses | $ 77,810 |  | $ 239,536 |  |  |

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