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Summary of Significant Accounting Policies (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
tenants
real_estate_investment
metropolitan
shares
Jun. 30, 2015
shares
Jun. 30, 2016
USD ($)
tenants
real_estate_investment
metropolitan
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
Summary of Significant Accounting Policies [Line Items]          
Provision for doubtful accounts $ 809   $ 809 $ 2,777  
Allowances for uncollectible tenant receivables 809   809   $ 0
Notes receivable, outstanding balance 16,519   16,519   13,000
Notes receivable, provision for loan loss related to carrying value 1,625   1,625    
Notes receivable, provision for loan loss related to accrued interest $ 41   $ 41    
Number of metropolitan statistical areas in which Company owns real estate investments | metropolitan 46   46    
Number of Company owned real estate investments | real_estate_investment 49   49    
Deferred financing costs, net $ 1,914   $ 1,914   2,854
Notes payable, deferred financing costs 3,334   3,334   4,261
Credit facility, deferred financing costs $ 2,190   $ 2,190   2,544
Period of notice required for changes to share repurchase program     30 days    
Maximum number of shares available for repurchase during any calendar year, as percentage of common stock outstanding at end of prior year     5.00%    
Repurchase of common stock     $ 16,996 $ 3,191  
Repurchase of common stock, average price per share (in dollars per share) | $ / shares     $ 9.67 $ 9.61  
Diluted earnings per share outstanding adjustment (in shares) | shares 19,000 14,000 20,000 16,000  
ASU 2015-03 [Member]          
Summary of Significant Accounting Policies [Line Items]          
Deferred financing costs, net         6,805
Notes payable, deferred financing costs         4,261
Credit facility, deferred financing costs         $ 2,544
Common Stock [Member]          
Summary of Significant Accounting Policies [Line Items]          
Repurchase of common stock (in shares) | shares     1,757,973 332,000  
Repurchase of common stock     $ 18    
Rental Revenue [Member] | Geographic Concentration Risk [Member]          
Summary of Significant Accounting Policies [Line Items]          
Number of metropolitan statistical areas in which Company owns real estate investments | metropolitan 3   3    
Rental Revenue [Member] | Geographic Concentration Risk [Member] | Dallas-Ft. Worth-Arlington, Texas MSA [Member]          
Summary of Significant Accounting Policies [Line Items]          
Concentration risk, percentage     13.10%    
Rental Revenue [Member] | Geographic Concentration Risk [Member] | Chicago-Naperville-Elgin, Illinois-Indiana-Wisconsin MSA [Member]          
Summary of Significant Accounting Policies [Line Items]          
Concentration risk, percentage     11.50%    
Rental Revenue [Member] | Geographic Concentration Risk [Member] | Houston-The Woodlands-Sugar Land, Texas MSA [Member]          
Summary of Significant Accounting Policies [Line Items]          
Concentration risk, percentage     10.00%    
Rental Revenue [Member] | Customer Concentration Risk [Member]          
Summary of Significant Accounting Policies [Line Items]          
Number of tenants | tenants 2   2    
Rental Revenue [Member] | Customer Concentration Risk [Member] | AT&T Services, Inc. [Member]          
Summary of Significant Accounting Policies [Line Items]          
Concentration risk, percentage     12.50%    
Rental Revenue [Member] | Customer Concentration Risk [Member] | Bay Area Regional Medical Center, LLC [Member]          
Summary of Significant Accounting Policies [Line Items]          
Concentration risk, percentage     10.00%    
Consolidated Partnership [Member]          
Summary of Significant Accounting Policies [Line Items]          
Number of Company owned real estate investments | real_estate_investment 1   1