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Revenue Recognition (Schedule of Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
OPERATING ACTIVITIES |  |  |  |
Net income | $ 28,484 | $ 15,220 | $ 69,272 | $ 27,427
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 17,436 | 15,522 | 52,852 | 45,367
Amortization | 2,366 | 2,608 | 7,571 | 7,889
Change in other noncurrent liabilities | (5,102) | (168) | (6,333) | (2,522)
Change in deferred taxes and other liabilities | 1,331 | (3,263) | (5,571) | (10,620)
Provision for write-off of property, plant and equipment | 2,131 | 1,086 | 3,255 | 1,916
Non-cash interest expense | 150 | 211 | 304 | 634
Compensation and benefits paid or payable in Class A Common Stock | 543 | 195 | 1,879 | 1,865
Fair value adjustment on foreign currency option | (10) | 2 | 61 | 131
Write-off of intangible assets in a discontinued product line |  | 4,149 |  | 4,149
Changes in operating assets and liabilities that provided/(used) cash: |  |  |  |
Accounts receivable | (4,177) | (4,645) | (48,547) | (19,781)
Contract assets | 3,040 |  | (8,721) |
Inventories | (2,228) | (3,944) | (12,843) | (17,210)
Prepaid expenses and other current assets | 103 | (601) | (5,117) | (3,298)
Income taxes prepaid and receivable | (551) |  | (454) | (2,817)
Accounts payable | (2,728) | (4,769) | 6,154 | (2,704)
Accrued liabilities | 7,565 | 5,425 | 12,233 | 4,525
Income taxes payable | 6,766 | 3,472 | 13,355 | 2,964
Noncurrent receivables | (4,676) | (8,107) | (8,846) | (15,643)
Other, net | (5,728) | (4,495) | (9,049) | (557)
Net cash provided by operating activities | 44,715 | 17,898 | 61,455 | 21,715
Net cash used in investing activities | (21,519) | (15,466) | (60,694) | (62,262)
Net cash (used in)/provided by financing activities | (12,904) | 4,393 | (16,474) | 3,395
Effect of exchange rate changes on cash and cash equivalents | (4,443) | 7,848 | (7,421) | 8,875
(Decrease)/increase in cash and cash equivalents | 5,849 | 14,673 | (23,134) | (28,277)
Cash and cash equivalents at beginning of period | 154,744 | 138,792 | 183,727 | 181,742
Cash and cash equivalents at end of period | 160,593 | $ 153,465 | 160,593 | $ 153,465
As reported [Member] |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net income | 28,484 |  | 69,272 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 17,436 |  | 52,852 |
Amortization | 2,366 |  | 7,571 |
Change in other noncurrent liabilities | (5,102) |  | (6,333) |
Change in deferred taxes and other liabilities | 1,331 |  | (5,571) |
Provision for write-off of property, plant and equipment | 2,131 |  | 3,255 |
Non-cash interest expense | 150 |  | 304 |
Compensation and benefits paid or payable in Class A Common Stock | 543 |  | 1,879 |
Fair value adjustment on foreign currency option | (10) |  | 61 |
Write-off of intangible assets in a discontinued product line |  |  |  |
Changes in operating assets and liabilities that provided/(used) cash: |  |  |  |
Accounts receivable | (4,177) |  | (48,547) |
Contract assets | 3,040 |  | (8,721) |
Inventories | (2,228) |  | (12,843) |
Prepaid expenses and other current assets | 103 |  | (5,117) |
Income taxes prepaid and receivable | (551) |  | (454) |
Accounts payable | (2,728) |  | 6,154 |
Accrued liabilities | 7,565 |  | 12,233 |
Income taxes payable | 6,766 |  | 13,355 |
Noncurrent receivables | (4,676) |  | (8,846) |
Other, net | (5,728) |  | (9,049) |
Net cash provided by operating activities | 44,715 |  | 61,455 |
Net cash used in investing activities | (21,519) |  | (60,694) |
Net cash (used in)/provided by financing activities | (12,904) |  | (16,474) |
Effect of exchange rate changes on cash and cash equivalents | (4,443) |  | (7,421) |
(Decrease)/increase in cash and cash equivalents | 5,849 |  | (23,134) |
Cash and cash equivalents at beginning of period | 154,744 |  | 183,727 |
Cash and cash equivalents at end of period | 160,593 |  | 160,593 |
Adjustments to reverse effects of ASC 606 [Member] |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net income | (767) |  | (3,416) |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation |  |  |  |
Amortization |  |  |  |
Change in other noncurrent liabilities |  |  |  |
Change in deferred taxes and other liabilities | (431) |  | (1,539) |
Provision for write-off of property, plant and equipment |  |  |  |
Non-cash interest expense |  |  |  |
Compensation and benefits paid or payable in Class A Common Stock |  |  |  |
Fair value adjustment on foreign currency option |  |  |  |
Write-off of intangible assets in a discontinued product line |  |  |  |
Changes in operating assets and liabilities that provided/(used) cash: |  |  |  |
Accounts receivable | 1,348 |  | (2,379) |
Contract assets | (3,040) |  | 8,721 |
Inventories | 2,902 |  | (1,320) |
Prepaid expenses and other current assets |  |  |  |
Income taxes prepaid and receivable |  |  |  |
Accounts payable |  |  |  |
Accrued liabilities | (12) |  | (67) |
Income taxes payable |  |  |  |
Noncurrent receivables |  |  |  |
Other, net |  |  |  |
Net cash provided by operating activities |  |  |  |
Net cash used in investing activities |  |  |  |
Net cash (used in)/provided by financing activities |  |  |  |
Effect of exchange rate changes on cash and cash equivalents |  |  |  |
(Decrease)/increase in cash and cash equivalents |  |  |  |
Cash and cash equivalents at beginning of period |  |  |  |
Cash and cash equivalents at end of period |  |  |  |
As adjusted to exclude adoption of ASC 606 [Member] |  |  |  |
OPERATING ACTIVITIES |  |  |  |
Net income | 27,717 |  | 65,856 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 17,436 |  | 52,852 |
Amortization | 2,366 |  | 7,571 |
Change in other noncurrent liabilities | (5,102) |  | (6,333) |
Change in deferred taxes and other liabilities | 900 |  | (7,110) |
Provision for write-off of property, plant and equipment | 2,131 |  | 3,255 |
Non-cash interest expense | 150 |  | 304 |
Compensation and benefits paid or payable in Class A Common Stock | 543 |  | 1,879 |
Fair value adjustment on foreign currency option | (10) |  | 61 |
Write-off of intangible assets in a discontinued product line |  |  |  |
Changes in operating assets and liabilities that provided/(used) cash: |  |  |  |
Accounts receivable | (2,829) |  | (50,926) |
Contract assets |  |  |  |
Inventories | 674 |  | (14,163) |
Prepaid expenses and other current assets | 103 |  | (5,117) |
Income taxes prepaid and receivable | (551) |  | (454) |
Accounts payable | (2,728) |  | 6,154 |
Accrued liabilities | 7,553 |  | 12,166 |
Income taxes payable | 6,766 |  | 13,355 |
Noncurrent receivables | (4,676) |  | (8,846) |
Other, net | (5,728) |  | (9,049) |
Net cash provided by operating activities | 44,715 |  | 61,455 |
Net cash used in investing activities | (21,519) |  | (60,694) |
Net cash (used in)/provided by financing activities | (12,904) |  | (16,474) |
Effect of exchange rate changes on cash and cash equivalents | (4,443) |  | (7,421) |
(Decrease)/increase in cash and cash equivalents | 5,849 |  | (23,134) |
Cash and cash equivalents at beginning of period | 154,744 |  | 183,727 |
Cash and cash equivalents at end of period | $ 160,593 |  | $ 160,593 |

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