Bank and Other Notes Payable - Narrative (Details)		12 Months Ended
	Mar. 29, 2013 USD ($)	Dec. 31, 2019 USD ($) derivative extension_period	Dec. 31, 2018 USD ($)
Bank and other notes payable
Number of extension options | extension_period		1
Number of interest rate swap agreements | derivative		4
Unamortized deferred finance costs		$ 16,042,000	$ 13,053,000
Availability for additional borrowings		$ 679,719,000	589,719,000
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
Line of Credit
Bank and other notes payable
Line of credit		820,000,000	910,000,000
Unamortized deferred finance costs		$ 2,623,000	$ 5,145,000
Average interest rate (as a percent)		3.92%	4.20%
Line of Credit | Level 2
Bank and other notes payable
Fair value of line of credit		$ 826,280,000	$ 912,163,000
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
Estimated fair value of term loan			$ 3,690,000
LIBOR | Line of Credit
Bank and other notes payable
Variable interest rate spread (as a percent)		1.55%
Revolving line of credit
Bank and other notes payable
Line of credit		$ 1,500,000,000
Maximum contingent borrowing capacity		$ 2,000,000,000
Revolving line of credit | Line of Credit | Interest rate swap
Bank and other notes payable
Effective interest rate		4.30%
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%