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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Senior Notes, Secured, and Unsecured Indebtedness - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 31, 2017	Aug. 11, 2014	Mar. 31, 2014
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ 0	$ (21,828)
Deferred loan costs	17,500
Notes payable	$ 172,246		$ 94,515
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%
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%
Unamortized premium	$ 700
Deferred loan costs	$ 3,800
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 \| 5 7/8% Senior Notes due January 31, 2025
Debt Instrument [Line Items]
Stated interest rate	5.875%			5.875%
Deferred loan costs	$ 7,000
Seller financing
Debt Instrument [Line Items]
Notes payable	$ 0		$ 589
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	$ 2,291		$ 0