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Fair Value of Financial Instruments (Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |
Net sales | $ 233,590 | $ 202,307 | $ 690,232 | $ 617,191 |
Cost of sales | 103,479 | 91,680 | 307,492 | 280,736 |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 4,887 | 1,710 | 6,751 | 7,202 |
Other Comprehensive Income (Loss), Tax | 1,181 | 413 | 1,631 | 1,740 |
Other comprehensive income (loss) before reclassifications | 3,706 | 1,297 | 5,120 | 5,462 |
Foreign Currency Transaction Gain (Loss), before Tax | (368) | (459) | (530) | (1,172) |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Asset Fair Value | 6,286 |  | 6,286 |  | $ 5,836
Liabilities Fair Value | (450) |  | (450) |  | (648)
Net Fair Value | 5,836 |  | 5,836 |  | 5,188
Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments | 138 | 237 | (355) | 565 |
Derivatives designated as hedged instruments: | Foreign Currency Forward Contracts |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Asset Fair Value | 6,271 |  | 6,271 |  |
Liabilities Fair Value | (326) |  | (326) |  |
Net Fair Value | 5,945 |  | 5,945 |  |
Derivatives designated as hedged instruments: | Foreign Currency Forward Contracts | Prepaids and other current assets |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Asset Fair Value | 5,336 |  | 5,336 |  | 5,817
Liabilities Fair Value | (256) |  | (256) |  | (431)
Net Fair Value | 5,080 |  | 5,080 |  | 5,386
Derivatives designated as hedged instruments: | Foreign Currency Forward Contracts | Other long-term assets |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Asset Fair Value | 935 |  | 935 |  |
Liabilities Fair Value | (70) |  | (70) |  |
Net Fair Value | 865 |  | 865 |  |
Derivatives not designated as hedging instruments: | Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of cash flow hedges | 34,457 |  | 34,457 |  | 39,631
Derivatives not designated as hedging instruments: | Foreign Currency Forward Contracts | Prepaids and other current assets |  |  |  |  |
Derivative Assets and Liabilities at Fair Value [Abstract] |  |  |  |  |
Asset Fair Value | 15 |  | 15 |  | 19
Liabilities Fair Value | (124) |  | (124) |  | (217)
Net Fair Value | (109) |  | $ (109) |  | (198)
Cash flow hedge | Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum Length of Time Hedged in Cash Flow Hedge |  |  | 2 years |  |
Notional amount of cash flow hedges | 155,877 |  | $ 155,877 |  | $ 155,313
Cash flow hedges realized gains (losses) | 2,361 | 147 | 6,193 | (1,498) |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 1,791 | 112 | 4,697 | (1,136) |
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months | 3,900 |  | $ 3,900 |  |
Derivatives not designated as hedging instruments: | Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum Length of Time Hedged in Cash Flow Hedge |  |  | 1 month |  |
Cash Flow Hedging Gain (Loss) |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax | 570 | 35 | $ 1,496 | (362) |
Revenues | Cash flow hedge | Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash flow hedges realized gains (losses) | 2,241 | (34) | 5,834 | (1,862) |
Cost of Sales | Cash flow hedge | Foreign Currency Forward Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash flow hedges realized gains (losses) | $ 120 | $ 181 | $ 359 | $ 364 |

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