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Debt Commitments and Contingencies - Annual Maturities of Note (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]    
Total debt $ 365,000 $ 90,000
Note [Member]    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2016 5,000  
2017 10,000  
Total debt $ 15,000 $ 0