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Combined Guarantor Subsidiaries - Organization and Basis of Presentation - Percentage of Actual Guarantor Properties Pledged as Collateral on Secured Credit (Details) - Guarantor Subsidiaries - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                      
Assets $ 1,657,113,000       $ 1,841,860,000       $ 1,657,113,000 $ 1,841,860,000  
Liabilities 300,542,000       437,237,000       300,542,000 437,237,000  
Revenue 73,803,000 $ 69,328,000 $ 68,868,000 $ 72,991,000 81,241,000 $ 78,655,000 $ 78,591,000 $ 80,438,000 284,990,000 [1] 318,925,000 [1] $ 344,057,000
Net income (11,761,000) $ 21,036,000 $ 22,775,000 $ 62,109,000 $ 29,225,000 $ 27,094,000 $ 27,117,000 $ 29,615,000 94,159,000 $ 113,051,000 $ 131,922,000
Collateral Pledged                      
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items]                      
Assets 1,326,247,000               1,326,247,000    
Liabilities $ 41,079,000               41,079,000    
Revenue                 222,014,000    
Net income                 $ 78,134,000    
Assets 80.00%               80.00%    
Liabilities 13.70%               13.70%    
Revenue                 77.90%    
Net Income                 83.00%    
[1] Sales taxes are excluded from revenues.