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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Components of Income Before Income Taxes | The components of the Company’s income before income taxes are as follows: ໿
﻿ |  | 2018 |  | 2017 |  | 2016
Loss before income taxes: |  |  |  |  |  |
Domestic |  | $ | (59,233 | ) |  | $ | (75,965 | ) |  | $ | (53,868 | )
Foreign |  | 16,005 |  |  | 18,444 |  |  | 14,056 |
Total |  | $ | (43,228 | ) |  | $ | (57,521 | ) |  | $ | (39,812 | )
Components of Income Tax Provision | The components of income tax provision for the years ended December 31, 2018, 2017 and 2016 are as follows: ໿
﻿ |  | 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |  |
U.S. federal |  | $ | (5,882 | ) |  | $ | (83 | ) |  | $ | (2,110 | )
State |  | 286 |  |  | 741 |  |  | 30 |
Foreign |  | 10,621 |  |  | 12,711 |  |  | 8,099 |
Total |  | 5,025 |  |  | 13,369 |  |  | 6,019 |
﻿ |  |  |  |  |  |
Deferred: |  |  |  |  |  |
U.S. federal |  | (322 | ) |  | — |  |  | (1,245 | )
State |  | 3 |  |  | 1,097 |  |  | — |
Foreign |  | (2,671 | ) |  | (6,664 | ) |  | (5,321 | )
Total |  | (2,990 | ) |  | (5,567 | ) |  | (6,566 | )
Total income tax provision (benefit) |  | $ | 2,035 |  |  | $ | 7,802 |  |  | $ | (547 | )
Schedule of Effective Tax Rate Reconciliation | The overall effective tax rate differs from the statutory federal tax rate for the years ended December 31, 2018, 2017 and 2016 as follows:
﻿ |  | % of Pretax Income
﻿ |  | 2018 |  | 2017 |  | 2016
Tax provision based on the federal statutory rate |  | 21.0 | % |  | 35.0 | % |  | 35.0 | %
Increase in valuation allowances |  | (34.8 | ) |  | 48.8 |  |  | (58.5 | )
Global intangible low-taxed income inclusion |  | (6.6 | ) |  | — |  |  | — |
One-Time transition tax |  | (2.8 | ) |  | (16.5 | ) |  | — |
Nondeductible expenses |  | (2.3 | ) |  | (3.3 | ) |  | (1.1 | )
Taxes related to distributions |  | (2.3 | ) |  | — |  |  | — |
Foreign income tax rate differential |  | (1.5 | ) |  | — |  |  | 3.1 |
Deemed income related to foreign operations |  | (1.5 | ) |  | (4.1 | ) |  | (8.4 | )
Foreign tax rate change |  | (1.4 | ) |  | 2.2 |  |  | — |
Employee share-based payments |  | 0.1 |  |  | (13.2 | ) |  | — |
Other |  | 0.6 |  |  | 2.9 |  |  | 1.7 |
Deferred tax adjustments |  | 0.9 |  |  | (1.1 | ) |  | 13.0 |
State taxes, net of federal benefit, before valuation allowance |  | 2.4 |  |  | 1.0 |  |  | 3.9 |
Return to provision adjustments |  | 2.7 |  |  | 2.0 |  |  | 18.8 |
Foreign tax credits related to above |  | — |  |  | — |  |  | 6.5 |
Other tax credits |  | 5.1 |  |  | — |  |  | — |
U.S. Tax Cuts and Jobs Act - rate change adjustment |  | 6.4 |  |  | (65.9 | ) |  | — |
Uncertain tax positions and audit settlements |  | 9.4 |  |  | (1.4 | ) |  | (25.1 | )
Foreign exchange loss |  | — |  |  | — |  |  | 9.4 |
Impairment of definite lived intangibles |  | — |  |  | — |  |  | 3.1 |
Effective tax rate |  | (4.6 | )% |  | (13.6 | )% |  | 1.4 | %
Components of Net Deferred Income Tax Assets and Net Deferred Income Tax Liabilities | The components of the Company’s net deferred income tax assets and net deferred income tax liabilities at December 31, 2018 and 2017 are as follows: ໿
(in thousands) |  | 2018 |  | 2017
Deferred income tax assets: |  |  |  |
Intangibles |  | $ | 22,530 |  |  | $ | 24,232 |
Stock options and restricted stock awards |  | 5,916 |  |  | 5,988 |
Reserves and allowances |  | 15,656 |  |  | 11,308 |
Net operating loss carryforwards |  | 41,356 |  |  | 35,004 |
Tax credit carryforwards |  | 13,669 |  |  | 10,908 |
Accrued liabilities |  | 3,040 |  |  | 3,011 |
Deferred revenue |  | 5,036 |  |  | 4,629 |
Valuation allowance |  | (95,398 | ) |  | (80,796 | )
Total deferred income tax assets |  | 11,805 |  |  | 14,284 |
﻿ |  |  |  |
Deferred income tax liabilities: |  |  |  |
Intangibles |  | 6,994 |  |  | 11,301 |
Property, plant and equipment |  | 5,265 |  |  | 7,304 |
Liabilities related to distributions |  | 997 |  |  | — |
Other |  | 522 |  |  | 642 |
Total deferred income tax liabilities |  | 13,778 |  |  | 19,247 |
﻿ |  |  |  |
Net deferred income tax liabilities |  | $ | (1,973 | ) |  | $ | (4,963 | )
Schedule of Unrecognized Tax Benefits |
﻿ |  | Unrecognized Tax Benefits
(in thousands) |  | 2018 |  | 2017 |  | 2016
Balance at January 1 |  | $ | (18,310 | ) |  | $ | (18,251 | ) |  | $ | (8,296 | )
Increases related to prior year tax positions |  | (1,400 | ) |  | (4,104 | ) |  | (2,658 | )
Decreases related to prior year tax positions |  | 8,272 |  |  | 4,045 |  |  | — |
Increases related to current year tax positions |  | (1,593 | ) |  | — |  |  | (7,297 | )
Balance at December 31 |  | $ | (13,031 | ) |  | $ | (18,310 | ) |  | $ | (18,251 | )
Summary of Deferred Income Tax Asset Valuation Allowance | The following presents the changes in the balance of the Company’s deferred income tax asset valuation allowance:
Year Ended |  | Item |  | Balance at beginning of year |  | Additions (reductions) charged to expense |  | Other |  | Balance at end of year
2018 |  | Deferred income tax asset valuation allowance |  | $ | 80,796 |  |  | $ | 14,602 |  |  | $ | — |  |  | $ | 95,398 |
2017 |  | Deferred income tax asset valuation allowance |  | 109,913 |  |  | (28,071 | ) |  | (1,046 | ) |  | 80,796 |
2016 |  | Deferred income tax asset valuation allowance |  | 107,312 |  |  | 20,450 |  |  | (17,849 | ) |  | 109,913 |

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