Non Marketable Investments	12 Months Ended
Non Marketable Investments	Dec. 31, 2014
Investment [Abstract]
Non Marketable Investments	Non Marketable Investments In December 2012, the Company made a non-controlling equity investment in GeNO, LLC (GeNO), an advanced, development-stage privately held technology company that has created unique nitric oxide generation and delivery technology. The Company classified the investment as a cost method investment and included it in other assets on the Company's consolidated balance sheets. The Company held less than 10% of the issued and outstanding shares of GeNO and does not have significant influence over the company. During the three month period ended September 30, 2014 the Company's investment in the common stock of GeNO, LLC became diluted, resulting in the determination by the Company that the investment's fair value was zero. As a result the Company recorded an investment impairment charge of $7.5 million representing an other-than-temporary decline in the value of the Company's investment in common stock of GeNO, LLC. In the third quarter 2014, the Company acquired additional ownership interests in Annovation, increasing the Company's equity ownership interest in Annovation to 36%. The Company has determined that its current ownership provides it with the ability to exercise significant influence, but not control, over Annovation's operating activities and, as a result, has accounted for its investment under the equity method. The investment is included in other assets on the consolidated balance sheet. The Company's proportionate share of the operating results of its equity investment is recorded as a loss in equity investment in the Company's consolidated statement of income. The retroactive application of the equity method resulted in an immaterial adjustment to the Company's financial statements for the year ended December 31, 2014.

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

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