Annual report pursuant to Section 13 and 15(d)

Insurance Claims - Additional Information (Details)

v3.8.0.1
Insurance Claims - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended 114 Months Ended
Sep. 30, 2008
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Insurance [Abstract]          
Retention amount per occurrence $ 10,000,000        
Maximum insurance coverage policy limit due to named windstorms for per incident 150,000,000        
Maximum insurance coverage policy limit except for property damage due to named windstorms $ 250,000,000        
Insurance reimbursements   $ 31,700,000 $ 10,200,000 $ 200,000  
Cumulative insurance recoveries related to hurricanes         $ 203,100,000
Outstanding hurricane claims   $ 0     $ 0