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Senior Notes, Secured, and Unsecured Indebtedness - Narrative (Details) - USD ($)	1 Months Ended				3 Months Ended
	Sep. 30, 2018	May 31, 2017	Jan. 31, 2015	Aug. 31, 2014	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 18, 2018	Mar. 30, 2018	Mar. 09, 2018	Mar. 08, 2018	Dec. 31, 2017	Dec. 30, 2017	Jul. 01, 2017	Jun. 29, 2017	Jan. 31, 2017	Dec. 30, 2016	Aug. 11, 2014	Mar. 31, 2014
Debt Instrument [Line Items]
Gain on extinguishment of debt					$ 383,000	$ 0
Deferred loan costs					(14,500,000)
Notes payable					$ 255,231,000			$ 198,019,000
8 1/2% Senior Notes due November 15, 2020
Debt Instrument [Line Items]
Stated interest rate					8.50%			8.50%
7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Stated interest rate					7.00%			7.00%
5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate					5.75%			5.75%
5 7/8% Senior Notes due January 31, 2025
Debt Instrument [Line Items]
Stated interest rate					5.875%			5.875%
6% Senior Notes due September 1, 2023
Debt Instrument [Line Items]
Stated interest rate					6.00%
Senior notes \| 8 1/2% Senior Notes due November 15, 2020
Debt Instrument [Line Items]
Stated interest rate					6.00%
Senior notes \| 7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Stated interest rate					7.00%			7.00%											7.00%
Percent exchanged			100.00%
Unamortized premium					$ 500,000
Deferred loan costs					$ (2,900,000)
Senior notes \| 5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate					5.75%			5.75%												5.75%
Percent exchanged				100.00%
Deferred loan costs					$ (5,800,000)
Senior notes \| 5 7/8% Senior Notes due January 31, 2025
Debt Instrument [Line Items]
Stated interest rate					5.875%												5.875%
Percent exchanged		100.00%
Deferred loan costs					$ (5,800,000)
Senior notes \| 6% Senior Notes due September 1, 2023
Debt Instrument [Line Items]
Stated interest rate					6.00%			6.00%			6.00%	6.00%
Percent exchanged	100.00%
Seller financing
Debt Instrument [Line Items]
Notes payable					$ 0			$ 0
Seller financing \| Note Payable Maturing in June 2018
Debt Instrument [Line Items]
Stated interest rate					7.00%
Construction notes payable
Debt Instrument [Line Items]
Notes payable					$ 1,204,000			$ 1,231,000
Revolving Credit Facility \| Second Amended Facility
Debt Instrument [Line Items]
Debt Instrument, Covenant, Tangible Net Worth, Minimum					$ 556,400,000.0
Debt Instrument, Covenant, Leverage Ratio, Maximum						60.00%		60.00%					62.50%	62.50%	60.00%	62.50%		65.00%
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum					1.50
Debt Instrument, Covenant, Interest Coverage Ratio, Maximum Liquidity Used in Calculation					$ 50,000,000.0
Revolving Credit Facility \| New Facility
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum					65.00%			62.50%	65.00%
Revolving Credit Facility \| Amendment to Second Amended Facility
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum						70.00%				60.00%
Subsequent Event \| Revolving Credit Facility \| New Facility
Debt Instrument [Line Items]
Debt Instrument, Covenant, Leverage Ratio, Maximum							60.00%