Income Taxes	9 Months Ended
Sep. 30, 2016
Income Taxes [Abstract]
Income Taxes	10. Income Taxes Income Tax Expense The Company’s effective income tax rate was approximately 37% and 46% for the three and nine months ended September 30, 2016, respectively, as compared to an expense of 25% and benefit of 9% for the three and nine months ended September 30, 2015, respectively. The Company’s income tax rate for the nine months ended September 30, 2016 was unfavorably impacted by the tax treatment of certain expenses related to the On-X acquisition, which had a larger impact on the tax rate in the first quarter of 2016, and by book/tax basis differences related to the HeRO Sale. The Company’s income tax rate for both the three and nine months ended September 30, 2015 was favorably affected by the reversal of $794,000 in uncertain tax positions, primarily related to research and development tax credits for which the statute of limitations has expired. This was partially offset by the unfavorable effect of the absence of the domestic production activities deduction, as the Company had not anticipated being eligible for this deduction in 2015. The Company’s income tax rate for the nine months ended September 30, 2015 did not include an anticipated benefit from the research and development tax credit, as this credit had not yet been enacted at that time. Deferred Income Taxes Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and tax return purposes. The Company generates deferred tax assets primarily as a result of book write-downs, reserves, or impairments which are not immediately deductible for tax return purposes. The Company acquired deferred tax assets, primarily net operating loss carryforwards, from its acquisitions of On-X in the first quarter of 2016, and from the acquisitions of Hemosphere and Cardiogenesis Corporation. The Company currently estimates that a portion of its state net operating loss carryforwards will not be recoverable and has, therefore, recorded a valuation allowance against these state net operating loss carryforwards. As of September 30, 2016 the Company maintained a total of $2.3 million in valuation allowances against deferred tax assets, related to state net operating loss carryforwards, and had a net deferred tax liability of $2.0 million. As of December 31, 2015 the Company had a total of $2.1 million in valuation allowances against deferred tax assets and a net deferred tax asset of $18.2 million.

10. Income Taxes

Income Tax Expense

The Company’s effective income tax rate was approximately 37% and 46% for the three and nine months ended September 30, 2016, respectively, as compared to an expense of 25% and benefit of 9% for the three and nine months ended September 30, 2015, respectively. The Company’s income tax rate for the nine months ended September 30, 2016 was unfavorably impacted by the tax treatment of certain expenses related to the On-X acquisition, which had a larger impact on the tax rate in the first quarter of 2016, and by book/tax basis differences related to the HeRO Sale.

The Company’s income tax rate for both the three and nine months ended September 30, 2015 was favorably affected by the reversal of $794,000 in uncertain tax positions, primarily related to research and development tax credits for which the statute of limitations has expired. This was partially offset by the unfavorable effect of the absence of the domestic production activities deduction, as the Company had not anticipated being eligible for this deduction in 2015. The Company’s income tax rate for the nine months ended September 30, 2015 did not include an anticipated benefit from the research and development tax credit, as this credit had not yet been enacted at that time.

Deferred Income Taxes

Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and tax return purposes. The Company generates deferred tax assets primarily as a result of book write-downs, reserves, or impairments which are not immediately deductible for tax return purposes. The Company acquired deferred tax assets, primarily net operating loss carryforwards, from its acquisitions of On-X in the first quarter of 2016, and from the acquisitions of Hemosphere and Cardiogenesis Corporation. The Company currently estimates that a portion of its state net operating loss carryforwards will not be recoverable and has, therefore, recorded a valuation allowance against these state net operating loss carryforwards.

As of September 30, 2016 the Company maintained a total of $2.3 million in valuation allowances against deferred tax assets, related to state net operating loss carryforwards, and had a net deferred tax liability of $2.0 million. As of December 31, 2015 the Company had a total of $2.1 million in valuation allowances against deferred tax assets and a net deferred tax asset of $18.2 million.