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Summary of Significant Accounting Policies - Share-Based Compensation/Contingent Liabilities (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
program
shares
Dec. 31, 2016
USD ($)
Other Liabilities [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Contingent liabilities | $ $ 0.4  
2014 Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of programs under plan | program 3  
Common Stock [Member] | 2014 Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of shares reserved for future issuance 7.00%  
Medical office [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Contingent liabilities | $   $ 0.5
Common Stock [Member] | 2014 Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized for issuance (in shares) | shares 525,782  
Number of shares available for issuance (in shares) | shares 106,712