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Senior Notes, Secured, and Unsecured Indebtedness - 5.875% Senior Notes (Details) - USD ($)					1 Months Ended			3 Months Ended		9 Months Ended
	Mar. 09, 2018	Jan. 31, 2017	Sep. 15, 2015	Aug. 11, 2014	Sep. 30, 2018	May 31, 2017	Jan. 31, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jul. 09, 2019	Dec. 31, 2018	Mar. 08, 2018
Debt Instrument [Line Items]
Deferred loan costs								$ (16,300,000)		$ (16,300,000)
Amount to be redeemed										4,000,000.0
(Loss) on extinguishment of debt, net								$ (1,816,000)	$ 0	$ (1,433,000)	$ 0
6% Senior Notes due September 1, 2023
Debt Instrument [Line Items]
Stated interest rate								6.00%		6.00%			6.00%
6% Senior Notes due September 1, 2023 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate	6.00%							6.00%		6.00%			6.00%	6.00%
Principal amount	$ 350,000,000
Percentage of principal amount	100.00%
Outstanding amount	$ 350,000,000
Percent exchanged					100.00%
5.875% Senior Notes due January 31, 2025
Debt Instrument [Line Items]
Stated interest rate								5.875%		5.875%			5.875%
5.875% Senior Notes due January 31, 2025 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate		5.875%						5.875%		5.875%			5.875%
Principal amount		$ 450,000,000
Percentage of principal amount		99.215%
Outstanding amount								$ 437,000,000		$ 437,000,000
Percent exchanged						100.00%
Unamortized discount								(2,500,000)		(2,500,000)
Deferred loan costs								$ (5,300,000)		$ (5,300,000)
7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Stated interest rate								7.00%		7.00%			7.00%
7% Senior Notes due August 15, 2022 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate				7.00%				7.00%		7.00%			7.00%
Principal amount			$ 50,000,000.0	$ 300,000,000
Percentage of principal amount			102.00%	100.00%
Outstanding amount								$ 50,000,000		$ 50,000,000		$ 350,000,000
Percent exchanged							100.00%
Deferred loan costs								$ (300,000)		$ (300,000)
8 1/2% Senior Notes due November 15, 2020 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate								8.50%		8.50%
Outstanding amount								$ 425,000,000		$ 425,000,000