Transactions With Related Parties	12 Months Ended
Transactions With Related Parties	Dec. 31, 2014
Transactions With Related Parties [Abstract]
Transactions With Related Parties	18. Transactions with Related Parties A member of the Company’s Board of Directors and a shareholder of the Company is an employee of an investment banking services company. The Company made stock repurchases of $5.6 million, $321,000, and $794,000 in 2014, 2013, and 2012, respectively, which includes the cost of stock and commissions of less than 1% to that investment banking services company. A member of the Company’s Board of Directors and a shareholder of the Company was the former Chief of Thoracic Surgery of a university hospital that generated product and preservation services revenues of $273,000, $353,000, and $267,000 for the Company in 2014, 2013, and 2012, respectively. Additionally, the son of this member of the Company’s Board of Directors receives a retainer for performing heart and lung transplants from a medical center that generated product and preservation services revenues of $616,000, $345,000, and $312,000 for the Company in 2014, 2013, and 2012, respectively. The Company expensed $45,000, $47,000, and $22,000 in 2014, 2013, and 2012, respectively, relating to supplies for clinical trials purchased from a company whose Chief Financial Officer is a member of the Company's Board of Directors and a shareholder of the Company. A relative of the Company’s Executive Chairman is employed as a vice president of the Company. His compensation and benefits are set and subject to review by the Compensation Committee of the Board of Directors.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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