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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective income tax rate | 56.00% | 4.00% | 41.00%
FDII deduction | $ 1,100,000 |  |
Interest deductibility threshold | 30.00% |  |
Interest deduction limit | $ 4,900,000 |  |
Excess interest not deducted | 21,100,000 |  |
Other | 169,000 | $ 18,000 | $ 88,000
Reversal in uncertain tax positions | (154,000) | (67,000) | (153,000)
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations | $ 467,000 | $ 254,000 | $ 227,000
Federal statutory income tax rate | 21.00% | 34.00% | 35.00%
Valuation allowances against deferred tax assets | $ 3,372,000 | $ 2,469,000 |
Net deferred tax liability | 23,156,000 | 28,821,000 |
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere | 3,100,000 |  |
State net operating loss carryforwards | 3,000,000 |  |
Foreign net operating loss carryforwards | 2,300,000 |  |
Research and development tax credit carryforwards | 648,000 |  |
Total uncertain tax liability including interest and penalties | 4,300,000 | 4,600,000 |
Uncertain tax liability recorded as reduction to deferred tax assets | 286,000 | 146,000 |
Uncertain tax liability recorded to non-current liability | 4,000,000 | $ 4,500,000 |
Approximate amount of uncertain tax liability to be recognized in 2018 | 1,200,000 |  |
Expires Tax Year 2025 [Member] |  |  |
Foreign net operating loss carryforwards | $ 832,000 |  |
Research [Member] |  |  |
Tax credit carryforwards expiration date | Dec. 31, 2022 |  |
Texas Tax Credit [Member] |  |  |
Other tax credit | $ 164,000 |  |
Federal [Member] |  |  |
Operating loss carryforwards expiration date | Dec. 31, 2018 |  |
State [Member] |  |  |
Operating loss carryforwards expiration date | Dec. 31, 2022 |  |
Foreign Authority [Member] |  |  |
Operating loss carryforwards expiration date | Dec. 31, 2025 |  |
Texas [Member] | State [Member] |  |  |
Tax credit carryforwards expiration date | Dec. 31, 2027 |  |

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