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Debt Obligations (Textual) (Details) - USD ($)
May 15, 2015
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Revolving Credit Facility [Member] | New Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt term 4 years      
Maximum borrowing capacity $ 600,000,000      
Line of credit   $ 0   $ 0
Secured Debt [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Weighted Average Interest Rate   4.03% 4.03%  
Long-term Debt, Gross   $ 323,823,000 $ 325,038,000