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Debt (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
lease
Debt      
Capital lease obligations $ 0 $ 0 $ 3,750,000
Amount of interest costs incurred, capitalized, and expensed      
Interest costs incurred 2,172,000 1,224,000 1,249,000
Less: Interest capitalized (144,000) (160,000) (72,000)
Interest expense $ 2,028,000 1,064,000 1,177,000
Base rate      
Debt      
Credit facility, interest rate basis base rate    
Line of credit      
Debt      
Credit facility, total available credit $ 304,000,000.0    
Primary Revolving Credit Facility      
Debt      
Credit facility, total available credit 300,000,000.0    
Credit facility, remaining borrowing capacity 2,500,000    
Total outstanding balances     $ 800.0
Long-term Debt $ 700,000 $ 800,000  
Primary Revolving Credit Facility | Minimum      
Debt      
Facility fees on the available commitment of the facility (as a percent) 0.15%    
Debt Instrument, Interest Rate, Stated Percentage 0.42%    
Primary Revolving Credit Facility | Maximum      
Debt      
Facility fees on the available commitment of the facility (as a percent) 0.30%    
Debt Instrument, Interest Rate, Stated Percentage 8.75%    
Primary Revolving Credit Facility | LIBOR      
Debt      
LIBOR Rate 1.75%    
Primary Revolving Credit Facility | LIBOR | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.60%    
Primary Revolving Credit Facility | LIBOR | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 1.45%    
Primary Revolving Credit Facility | Base rate | Minimum      
Debt      
Credit facility, interest rate spread (as a percent) 0.00%    
Primary Revolving Credit Facility | Base rate | Maximum      
Debt      
Credit facility, interest rate spread (as a percent) 0.45%    
Cisco Systems Capital Corporation      
Debt      
Capital Lease Obligations, Term   4 years  
Cisco Systems Capital Corporation | Minimum      
Debt      
Debt Instrument, Interest Rate, Stated Percentage   2.89%  
Number of Capital Lease Obligations | lease     2
Cisco Systems Capital Corporation | Maximum      
Debt      
Debt Instrument, Interest Rate, Stated Percentage   3.50%  
Number of Capital Lease Obligations | lease     4