Contractual interest rate for funds borrowed, under the debt agreement.

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Senior Notes, Secured, and Unsecured Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 09, 2018	Mar. 08, 2018	Jan. 31, 2017	Aug. 11, 2014	Mar. 31, 2014
Debt Instrument [Line Items]
Total notes payable	$ 255,231	$ 198,019
Total debt	$ 1,375,506	1,321,345
5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Total debt		$ 0
Stated interest rate	5.75%	5.75%
7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Total debt	$ 347,639	$ 347,456
Stated interest rate	7.00%	7.00%
6% Senior Notes due September 1, 2023
Debt Instrument [Line Items]
Total debt	$ 344,206	$ 343,878
Stated interest rate	6.00%
5 7/8% Senior Notes due January 31, 2025
Debt Instrument [Line Items]
Total debt	$ 428,430	$ 431,992
Stated interest rate	5.875%	5.875%
Seller financing
Debt Instrument [Line Items]
Total notes payable	$ 0	$ 0
Construction notes payable
Debt Instrument [Line Items]
Total notes payable	1,204	1,231
Joint venture notes payable
Debt Instrument [Line Items]
Total notes payable	144,027	151,788
Senior notes
Debt Instrument [Line Items]
Total debt	$ 1,120,275	$ 1,123,326
Senior notes \| 5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate	5.75%	5.75%					5.75%
Senior notes \| 7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Total debt	$ 347,639	$ 347,456
Stated interest rate	7.00%	7.00%				7.00%
Senior notes \| 6% Senior Notes due September 1, 2023
Debt Instrument [Line Items]
Total debt	$ 344,206	$ 343,878
Stated interest rate	6.00%	6.00%	6.00%	6.00%
Senior notes \| 5 7/8% Senior Notes due January 31, 2025
Debt Instrument [Line Items]
Total debt	$ 428,430	$ 431,992
Stated interest rate	5.875%				5.875%