Fair Value Measurements Financial instruments with significant Level 3 inputs (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	May. 08, 2014	Oct. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 3,011,700			$ 7,080,000
Percentage of Net Sales						10.00%
Percentage of license cost						30.00%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration	13,460,000			18,260,000	$ 11,900,000
Accrued Liabilities and Other Liabilities	13,460,000			18,260,000
Change in acquisition-related contingent consideration	(4,800,000)	$ 400,000
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(4,800,000)
Contingent Consideration Classified as Equity [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration	13,460,000			18,260,000
Change in acquisition-related contingent consideration	(4,800,000)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0			0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accrued Liabilities and Other Liabilities	0			0
Contingent Consideration Classified as Equity, Fair Value Disclosure	0			0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	3,011,700			7,080,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accrued Liabilities and Other Liabilities	0			0
Contingent Consideration Classified as Equity, Fair Value Disclosure	0			0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0			0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accrued Liabilities and Other Liabilities	13,460,000			18,260,000
Contingent Consideration Classified as Equity, Fair Value Disclosure	13,460,000			$ 18,260,000
Amorcyte, LLC [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration	$ 0		$ 5,600,000