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Bank and Other Notes Payable - Narrative (Details)
 12 Months Ended
Mar. 29, 2013
USD ($)
Dec. 31, 2018
USD ($)
derivative
Dec. 31, 2017
USD ($)
Bank and other notes payable      
Number of interest rate swap agreements | derivative   4  
Deferred finance cost   $ (13,053,000) $ (17,838,000)
Availability for additional borrowings   589,719,000 504,412,000
Line of Credit      
Bank and other notes payable      
Line of credit   910,000,000 935,000,000
Deferred finance cost   $ (5,145,000) $ (7,548,000)
Average interest rate (as a percent)   4.20% 3.13%
Line of Credit | Level 2      
Bank and other notes payable      
Fair value of line of credit   $ 912,163,000 $ 919,158,000
Line of Credit | LIBOR      
Bank and other notes payable      
Variable interest rate spread (as a percent)   1.45%  
Prasada Note      
Bank and other notes payable      
Debt issued $ 13,330,000    
Interest rate on debt (as a percent) 5.25%    
Carrying value of term loan   $ 3,689,000 4,732,000
Estimated fair value of term loan   3,690,000 $ 4,717,000
Revolving line of credit      
Bank and other notes payable      
Line of credit   $ 1,500,000,000  
Extension option term   1 year  
Maximum contingent borrowing capacity   $ 2,000,000,000  
Revolving line of credit | LIBOR | Low end of range      
Bank and other notes payable      
Variable interest rate spread (as a percent)   1.30%  
Revolving line of credit | LIBOR | High end of range      
Bank and other notes payable      
Variable interest rate spread (as a percent)   1.90%  
Interest rate swap      
Bank and other notes payable      
Number of interest rate swap agreements | derivative   4  
Interest rate swap | Level 2      
Bank and other notes payable      
Line of credit   $ 400,000,000