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Debt - Accounts Receivable and Mortgage Securitization Program Narrative (Details) - Secured Debt - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2017
Oct. 31, 2016
Mar. 31, 2015
Accounts Receivable Securitization Program          
Debt Instrument [Line Items]          
Maximum borrowing capacity     $ 275,000,000   $ 250,000,000
Line of credit $ 272,062,000 $ 221,673,000      
Effective interest rate (as a percent) 2.80% 3.00%      
Commitment fee percentage 4.00%        
Mortgage Securitization Program          
Debt Instrument [Line Items]          
Maximum borrowing capacity       $ 50,000,000  
Line of credit $ 50,000,000 $ 50,000,000      
Effective interest rate (as a percent) 3.50% 3.50%