Fair Value Measurements (Details 1) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Liabilities:
Total liabilities	$ 10,049	$ 15,058
Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		4,957
Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		9,593
Other Derivative Instrument [Member]
Liabilities:
Derivative fair value of derivative liability	762	508
Equity Securities [Member]
Assets:
Equity securities	4,488	2,766
Fair Value, Inputs, Level 1 [Member]
Liabilities:
Total liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 1 [Member] | Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 1 [Member] | Other Derivative Instrument [Member]
Liabilities:
Derivative fair value of derivative liability	0	0
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Assets:
Equity securities	4,209	2,756
Fair Value, Inputs, Level 2 [Member]
Liabilities:
Total liabilities	762	508
Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 2 [Member] | Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		0
Fair Value, Inputs, Level 2 [Member] | Other Derivative Instrument [Member]
Liabilities:
Derivative fair value of derivative liability	762	508
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Assets:
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Total liabilities	9,287	14,550
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member]
Liabilities:
Derivative fair value of derivative liability		4,957
Fair Value, Inputs, Level 3 [Member] | Rochester Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability		9,593
Fair Value, Inputs, Level 3 [Member] | Other Derivative Instrument [Member]
Liabilities:
Derivative fair value of derivative liability	0	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Assets:
Equity securities	279	$ 10
Rochester Royalty Obligation [Member] | Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	9,287
Rochester Royalty Obligation [Member] | Fair Value, Inputs, Level 1 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	0
Rochester Royalty Obligation [Member] | Fair Value, Inputs, Level 2 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	0
Rochester Royalty Obligation [Member] | Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member]
Liabilities:
Derivative fair value of derivative liability	$ 9,287