Income Taxes	3 Months Ended
Mar. 31, 2016
Income Taxes [Abstract]
Income Taxes	10. Income Taxes Income Tax Expense The Company’s effective income tax rate was approximately 58% for the three months ended March 31, 2016, as compared to 85% for the three months ended March 31, 2015. The Company’s income tax rate for the three months ended March 31, 2016 was unfavorably impacted by the tax treatment of certain expenses related to the On-X acquisition and by book-to-tax basis differences related to the HeRO Sale. The Company’s income tax rate for the three months ended March 31, 2015 was unfavorably affected by the absence of the domestic production activities deduction, as the Company did not anticipate being eligible for this deduction in 2015, and by other permanent book/tax differences, which were expected to have a proportionally larger impact in 2015 than in the current year when compared to the Company’s estimates of pretax book income. The Company’s income tax rate for the three months ended March 31, 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, 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 March 31, 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 a net deferred tax asset of $1.6 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 58% for the three months ended March 31, 2016, as compared to 85% for the three months ended March 31, 2015. The Company’s income tax rate for the three months ended March 31, 2016 was unfavorably impacted by the tax treatment of certain expenses related to the On-X acquisition and by book-to-tax basis differences related to the HeRO Sale.

The Company’s income tax rate for the three months ended March 31, 2015 was unfavorably affected by the absence of the domestic production activities deduction, as the Company did not anticipate being eligible for this deduction in 2015, and by other permanent book/tax differences, which were expected to have a proportionally larger impact in 2015 than in the current year when compared to the Company’s estimates of pretax book income. The Company’s income tax rate for the three months ended March 31, 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, 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 March 31, 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 a net deferred tax asset of $1.6 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.