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Credit Facility (Details)
3 Months Ended 12 Months Ended
Nov. 04, 2019
USD ($)
Apr. 26, 2018
USD ($)
Mar. 31, 2020
Dec. 31, 2019
USD ($)
exception
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 16, 2017
USD ($)
Line of Credit Facility [Line Items]                
Credit facility       $ 333,147,000 $ 324,700,000      
Cash and cash equivalents       81,898,000 $ 91,451,000   $ 107,666,000  
Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Unused borrowing capacity       $ 232,800,000        
Weighted average interest rate       3.80% 4.12%      
Debt covenant cash and borrowing availability required       $ 40,000,000.0        
Amended Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Borrowing capacity               $ 325,000,000.0
New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Borrowing capacity   $ 415,000,000.0       $ 540,000,000.0    
Additional borrowing capacity       125,000,000.0   $ 125,000,000.0    
Additional borrowing capacity accordion feature   $ 500,000,000.0   375,000,000.0        
Credit facility       333,100,000        
Current borrowing capacity       484,100,000        
Unused borrowing capacity       $ 150,900,000        
Extension period   1 year            
Number of limited exceptions | exception       3        
Debt covenant cash and borrowing availability required $ 60,000,000.0              
Minimum | Interest rate, option two | Federal Funds Effective Rate | Amended Credit Facility                
Line of Credit Facility [Line Items]                
Basis spread on variable rate   0.60%            
Minimum | Interest rate, option two | London Interbank Offered Rate (LIBOR) | Amended Credit Facility                
Line of Credit Facility [Line Items]                
Basis spread on variable rate   1.60%            
Maximum | Interest rate, option two | Federal Funds Effective Rate | Amended Credit Facility                
Line of Credit Facility [Line Items]                
Basis spread on variable rate   1.20%            
Maximum | Interest rate, option two | London Interbank Offered Rate (LIBOR) | Amended Credit Facility                
Line of Credit Facility [Line Items]                
Basis spread on variable rate   2.20%            
Four Consecutive Fiscal Quarters [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent of modified FFO maximum in rolling four quarter period       95.00%        
Three Consecutive Fiscal Quarters [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent of modified FFO maximum in individual quarter over three consecutive quarters       110.00%        
Prior Fiscal Quarter [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent of modified FFO maximum in rolling four quarter period       95.00%        
Current Fiscal Quarter And Prior Fiscal Quarter [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent of modified FFO maximum in rolling four quarter period       95.00%        
Two Consecutive Fiscal Quarters [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent fo modified FFO maximum in individual quarter over two consecutive quarters 105.00%              
Forecast [Member] | Four Consecutive Fiscal Quarters [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent of modified FFO maximum in rolling four quarter period     95.00%          
Forecast [Member] | Current Fiscal Quarter And Prior Two Fiscal Quarters [Member] | New Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Dividends as percent of modified FFO maximum in rolling four quarter period     95.00%