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New Accounting Pronouncements (Condensed Consolidated Cash Flow) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities: |  |
Net income (loss) | $ (23,641) | $ 8,555
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation | 9,541 | 9,320
Amortization | 2,843 | 2,953
Deferred income taxes | 39,000 | 74
Gain on the sale of property, plant and equipment | (46) | (197)
Stock-based compensation expense | 2,870 | 2,160
Changes in operating assets and liabilities: |  |
Accounts receivable | 33,419 | 59,685
Contract assets | (1,127) | 6,561
Inventories | (38,210) | (29,582)
Prepaid expenses and other assets | 5,944 | (3,292)
Accounts payable | 2,337 | 16,225
Accrued liabilities | (9,116) | 5,256
Income taxes | 716 | 187
Net cash provided by operations | 24,530 | 77,905
Cash flows from investing activities: |  |
Net cash used in investing activities | (20,999) | (7,469)
Cash flows from financing activities: |  |
Net provided by financing activities | (70,616) | 267
Effect of exchange rate changes | 866 | 341
Net increase in cash and cash equivalents | (66,219) | 71,044
Cash and cash equivalents at beginning of year | 742,546 | 681,433
Cash and cash equivalents at end of period | 676,327 | 752,477
Accounting Standards Update 2014-09 [Member] | As Previously Reported [Member] | Calculated Under Revenue Guidance In Effect Before Topic 606 [Member] |  |
Cash flows from operating activities: |  |
Net income (loss) |  | 9,687
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation |  | 9,320
Amortization |  | 2,953
Deferred income taxes |  | 1,041
Gain on the sale of property, plant and equipment |  | (197)
Stock-based compensation expense |  | 2,160
Changes in operating assets and liabilities: |  |
Accounts receivable |  | 59,685
Contract assets |  | 0
Inventories |  | (22,512)
Prepaid expenses and other assets |  | (5,329)
Accounts payable |  | 16,225
Accrued liabilities |  | 5,256
Income taxes |  | (384)
Net cash provided by operations |  | 77,905
Cash flows from investing activities: |  |
Net cash used in investing activities |  | (7,469)
Cash flows from financing activities: |  |
Net provided by financing activities |  | 267
Effect of exchange rate changes |  | 341
Net increase in cash and cash equivalents |  | 71,044
Cash and cash equivalents at beginning of year | 742,546 | 681,433
Cash and cash equivalents at end of period |  | 752,477
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member] | Adjustments [Member] |  |
Cash flows from operating activities: |  |
Net income (loss) |  | (1,132)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation |  | 0
Amortization |  | 0
Deferred income taxes |  | (967)
Gain on the sale of property, plant and equipment |  | 0
Stock-based compensation expense |  | 0
Changes in operating assets and liabilities: |  |
Accounts receivable |  | 0
Contract assets |  | 6,561
Inventories |  | (7,070)
Prepaid expenses and other assets |  | 2,037
Accounts payable |  | 0
Accrued liabilities |  | 0
Income taxes |  | 571
Net cash provided by operations |  | 0
Cash flows from investing activities: |  |
Net cash used in investing activities |  | 0
Cash flows from financing activities: |  |
Net provided by financing activities |  | 0
Effect of exchange rate changes |  | 0
Net increase in cash and cash equivalents |  | 0
Cash and cash equivalents at beginning of year | $ 0 | 0
Cash and cash equivalents at end of period |  | $ 0

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