Fair Value Measurements (Details 2) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Equity Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 279
Revaluation	0
Settlements	0
Balance at the end of the period	279
Rochester Royalty Obligation [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	9,287
Revaluation	1,200
Settlements	(1,210)
Balance at the end of the period	$ 9,277