Summary of Significant Accounting Policies (Details)  | 
3 Months Ended | 
|---|---|
| 
 Mar. 31, 2018  
USD ($)  
lease 
 | |
| Accounting Policies [Abstract] | |
| Income tax benefit | $ | $ 34,000 | 
| Number of operating ground lease arrangements | lease | 2 | 
| X | ||||||||||
- References No definition available. 
  | 
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
| X | ||||||||||
- Definition The number of units (items of property) under operating lease arrangements. No definition available. 
  |