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Financial Instruments (Schedule of future minimum annual lease payments) (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
Long-term Debt and Capital Lease Obligations [Abstract]  
2016 $ 1,213
2017 2,425
2018 2,473
2019 2,473
2020 2,520
Thereafter 18,754
Total minimum lease payments 29,858
Less: Amount representing interest 6,165
Present value of minimum lease payments $ 23,693