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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 28, 2017
Mar. 17, 2015
Mar. 11, 2015
Mar. 02, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 15, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share awards granted         96,286      
Unrecognized compensation cost         $ 1,573      
Unrecognized compensation cost recognition period         3 years 2 months 12 days      
Common units redemption to common stock         12.50%      
Stock-based compensation         $ 1,237 $ 305 $ 285  
2006 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized         9,615      
Expiration date         Dec. 31, 2015      
Shares issued to independent directors             3,295  
2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares available for issuance         357,742      
Vesting period         5 years      
Shares issued to independent directors         5,369 2,361    
Maximum [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized               461,538
Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested options, outstanding           865    
Vested options, weighted average exercise price           $ 48.945    
Market Based Share Awards [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation cost $ 1,305              
Market Based Share Awards [Member] | Executive Officer [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized 36,692              
Market price target increments $ 1              
Trading period used to determine award price 60 days              
Market Based Share Awards [Member] | Executive Officer [Member] | Minimum [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Market price target $ 11.00              
Market Based Share Awards [Member] | Executive Officer [Member] | Maximum [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Market price target $ 18.00              
Performance Based Share Awards [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share awards granted       101,213        
Units earned, increments       33.33%        
Performance Based Share Awards [Member] | Share-based Compensation Award, Tranche One [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock price per share milestone       $ 22.75        
Vesting percentage       1.923%        
Performance Based Share Awards [Member] | Share-based Compensation Award, Tranche Two [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock price per share milestone       $ 29.25        
Performance Based Share Awards [Member] | Share-based Compensation Award, Tranche Three [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock price per share milestone       $ 35.75        
Performance Based Share Awards [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation cost         $ 191      
Additional shares earned per percentage if actual FFO exceeds budgeted FFO 391              
Percentage increment required to earn additional shares 2.00%              
Grant date fair value, assumed percentage of budgeted FFO         100.00%      
Performance Based Share Awards [Member] | Minimum [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Required percentage of budgeted FFO to achieve performance award 85.00%              
Potential shares earned and issued if operating results are obtained 11,741              
Performance Based Share Awards [Member] | Maximum [Member] | 2016 Stock Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Required percentage of budgeted FFO to achieve performance award 101.00%              
Potential shares earned and issued if operating results are obtained 19,569              
Additional shares earned per percentage if actual FFO exceeds budgeted FFO 3,910              
Performance Based Share Awards [Member] | Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share awards granted       5,263,152        
Warrants [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock warrants, exercise price         $ 12.48      
Warrants [Member] | Executive Officer [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares called by warrant       101,213        
Common stock warrants, exercise price   $ 12.48 $ 9.88 $ 9.88        
Expiration period         3 years      
Shares purchased with warrants     35,060   66,153      
Warrants [Member] | Executive Officer [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Units earned, increments   33.33%            
Warrants [Member] | Executive Officer [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Units earned, increments   50.00%