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Segment Reporting - Additional Information (Details) - segment
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]            
Number of reportable segments   4 4 4 4  
Claren Road            
Segment Reporting Information [Line Items]            
Percentage of economic interest (percent)           55.00%
Revised ownership interest (percent) 63.00%