Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Basis of presentation (Details)

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Summary of Significant Accounting Policies - Basis of presentation (Details) - segment
12 Months Ended
Jun. 30, 2015
Dec. 31, 2016
Summary of Significant Accounting Policies    
Percentage Of Capital Distribution 100.00%  
Number of reportable segments   2