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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2017
Employee Benefit Plans [Abstract]
Employee Benefit Plans	16. Employee Benefit Plans 401(k) Plan We have a 401(k) savings plan (“401(k) Plan”) providing retirement benefits to all employees who have completed at least three months of service. We made matching contributions of 100% of each participant's contribution for up to 3% of each participant’s salary in 2017. We made matching contributions of 40% of each participant's contribution for up to 5% of each participant’s salary in 2016 and 2015. Our contributions approximated $1.4 million, $750,000, and $573,000 for the years ended 2017, 2016, and 2015, respectively. The increase in expenses in 2017 was primarily due to the increase in our matching contribution. The increase in expenses in 2016 was due, in part, to the addition of participants related to the acquisition of On-X. Additionally, we may make discretionary contributions to the 401(k) Plan; however, no discretionary contributions were made in any of the past three years. Deferred Compensation Plan On January 1, 2011 we initiated a nonqualified Deferred Compensation Plan (“Deferred Plan”). The Deferred Plan allows certain or our employees to defer receipt of a portion of their salary and cash bonus. The Deferred Plan provides for tax-deferred growth of deferred compensation. Pursuant to the terms of the Deferred Plan, we agree to return the deferred amounts plus gains and losses, based on investment fund options chosen by each respective participant, to the plan participants upon distribution. All deferred amounts and deemed earnings thereon are vested at all times. We have no current plans to match any contributions. Amounts owed to plan participants are unsecured obligations of the Company. We have established a rabbi trust in which it will make contributions to fund our obligations under the Deferred Plan. Pursuant to the terms of the trust, we will be required to make contributions each year to fully match our obligations under the Deferred Plan. The trust’s funds are primarily invested in Company Owned Life Insurance (“COLI”), and we plan to hold the policies until the deaths of the insured. Our deferred compensation liabilities are recorded as a component of other current liabilities or long-term deferred compensation liabilities, as appropriate, based on anticipated distribution dates. The cash surrender value of COLI is recorded in other long-term assets. Changes in the value of participant accounts and changes in the cash surrender value of COLI are recorded as part of our operating expenses and are subject to our normal allocation of expenses to inventory and deferred preservation costs.