Annual report pursuant to Section 13 and 15(d)

Notes Receivable (Future Contractual Principal Payments Of Notes Receivables) (Details)

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Notes Receivable (Future Contractual Principal Payments Of Notes Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Notes Receivable [Abstract]    
2018 $ 62,360  
2019 56,879  
2020 59,500  
2021 63,061  
2022 66,246  
Thereafter 242,603  
Total $ 550,649 $ 546,070