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Income Taxes Income tax disclosure (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Income from continuing operations before taxes consisted of the following (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
United States |  | $ | 59,872 |  |  | $ | 80,714 |  |  | $ | 74,288 |
Foreign |  | (8,589 | ) |  | 4,450 |  |  | (4,589 | )
|  | $ | 51,283 |  |  | $ | 85,164 |  |  | $ | 69,699 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The (benefit) provision for income taxes consisted of the following (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |  |  |  |  |
Federal |  | $ | 2,774 |  |  | $ | 21,123 |  |  | $ | 18,601 |
State |  | 2,263 |  |  | 2,347 |  |  | 745 |
Foreign |  | 3,170 |  |  | 1,118 |  |  | 1,426 |
|  | 8,207 |  |  | 24,588 |  |  | 20,772 |
Deferred: |  |  |  |  |  |  |  |  |
Federal |  | $ | (20,878 | ) |  | $ | (2,045 | ) |  | $ | 4,524 |
State |  | (4,619 | ) |  | (767 | ) |  | (960 | )
Foreign |  | (71 | ) |  | 304 |  |  | 378 |
|  | (25,568 | ) |  | (2,508 | ) |  | 3,942 |
|  | $ | (17,361 | ) |  | $ | 22,080 |  |  | $ | 24,714 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of the provision for income taxes at the statutory rate to our effective tax rate is as follows (dollars in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | Amount |  | Percent |  | Amount |  | Percent |  | Amount |  | Percent
Federal tax at the expected statutory rate |  | $ | 17,950 |  |  | 35.0 | % |  | $ | 29,807 |  |  | 35.0 | % |  | $ | 24,395 |  |  | 35.0 | %
State income tax, net of federal effect |  | (403 | ) |  | (0.8 | )% |  | 1,795 |  |  | 2.1 | % |  | 2,661 |  |  | 3.9 | %
Tax credits |  | (2,783 | ) |  | (5.4 | )% |  | (1,014 | ) |  | (1.2 | )% |  | (5,861 | ) |  | (8.4 | )%
Foreign income tax differential |  | 3,481 |  |  | 6.8 | % |  | (135 | ) |  | (0.1 | )% |  | 3,412 |  |  | 4.9 | %
Stock based compensation |  | (18,958 | ) |  | (37.0 | )% |  | (7,720 | ) |  | (9.1 | )% |  | — |  |  | — | %
Impact of the Tax Act |  | 3,076 |  |  | 6.0 | % |  | — |  |  | — | % |  | — |  |  | — | %
IP installment sale |  | 3,367 |  |  | 6.6 | % |  | — |  |  | — | % |  | — |  |  | — | %
Bargain purchase gain |  | (24,811 | ) |  | (48.4 | )% |  | — |  |  | — | % |  | — |  |  | — | %
Other |  | 1,720 |  |  | 3.4 | % |  | (653 | ) |  | (0.8 | )% |  | 107 |  |  | 0.1 | %
|  | $ | (17,361 | ) |  | (33.8 | )% |  | $ | 22,080 |  |  | 25.9 | % |  | $ | 24,714 |  |  | 35.5 | %
Deferred tax provision table text block [Table Text Block] |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The components of our deferred income tax assets (liabilities) are as follows (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Deferred tax asset: |  |  |  |  |  |
Foreign |  | $ | — |  |  | $ | 1,223 |
Accruals/other |  | 8,368 |  |  | 857 |
Acquired future tax deductions |  | 10,580 |  |  | 6,473 |
Stock-based compensation |  | 8,633 |  |  | 11,089 |
Foreign currency translation adjustments |  | 3,425 |  |  | 5,175 |
Tax credits state |  | 8,471 |  |  | 6,764 |
Foreign tax credits |  | 2,749 |  |  | — |
Inventory reserves |  | 10,658 |  |  | 1,938 |
Allowance for doubtful accounts |  | 636 |  |  | 151 |
Valuation allowance |  | (7,385 | ) |  | — |
|  | $ | 46,135 |  |  | $ | 33,670 |
Deferred tax liability: |  |  |  |  |  |
State income taxes |  | $ | 1,640 |  |  | $ | 1,708 |
Foreign |  | 202 |  |  | 1,370 |
Depreciation and amortization |  | 21,005 |  |  | 10,027 |
|  | $ | 22,847 |  |  | $ | 13,105 |
Deferred tax asset, net |  | $ | 23,288 |  |  | $ | 20,565 |
Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] | The following table summarizes our cumulative gross unrecognized tax benefits (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Beginning balance |  | $ | 2,000 |  |  | $ | 1,772 |  |  | $ | 4,115 |
Increases to prior year tax positions |  | 77 |  |  | 77 |  |  | 25 |
Increases due to acquisitions |  | 640 |  |  | — |  |  | — |
Increases to current year tax positions |  | 3,992 |  |  | 345 |  |  | 345 |
Decreases to prior year tax positions |  | (12 | ) |  | (46 | ) |  | (2,399 | )
Decrease related to settlements |  | — |  |  | — |  |  | (314 | )
Decrease related to lapse of statute of limitations |  | (170 | ) |  | (148 | ) |  | — |
Ending balance |  | $ | 6,527 |  |  | $ | 2,000 |  |  | $ | 1,772 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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