Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Debt Instrument Issuance Price Percentage On Face Value

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Debt Instrument, Redemption, Expected Percent Redeemed

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Debt Instrument, Redemption, Percent Redeemed

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Senior Notes, Secured, and Unsecured Indebtedness - Senior Notes - Narrative (Details) - USD ($)							1 Months Ended					3 Months Ended
	Sep. 15, 2015	Aug. 11, 2014	Mar. 31, 2014	Oct. 24, 2013	Nov. 08, 2012	Sep. 03, 2009	Jan. 31, 2016	Jan. 31, 2015	Aug. 31, 2014	Feb. 28, 2014	Jul. 31, 2013	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Deferred loan costs												$ (12,700,000)
Maturity date						Sep. 30, 2016
5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate												5.75%	5.75%
Total senior notes												$ 148,429,000	$ 148,295,000
8 1/2% Senior Notes due November 15, 2020
Debt Instrument [Line Items]
Stated interest rate												8.50%	8.50%
Total senior notes												$ 422,887,000	$ 422,896,000
7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Stated interest rate												7.00%	7.00%
Total senior notes												$ 345,474,000	$ 345,338,000
Senior notes \| 5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate			5.75%									5.75%
Principal amount												$ 150,000,000
Percentage of principal amount			100.00%
Percent exchanged									100.00%
Deferred loan costs			$ (1,600,000)
Maturity date												Apr. 15, 2019
Senior notes \| 8 1/2% Senior Notes due November 15, 2020
Debt Instrument [Line Items]
Stated interest rate					8.50%							8.50%
Principal amount				$ 100,000,000.0	$ 325,000,000							$ 425,000,000
Percentage of principal amount				106.50%	100.00%
Percent exchanged										100.00%	100.00%
Unamortized premium												3,600,000
Deferred loan costs												$ (5,700,000)
Maturity date												Nov. 15, 2020
Net proceeds from issuance of debt				$ 104,700,000
Outstanding amount												$ 425,000,000
Senior notes \| 7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Stated interest rate		7.00%										7.00%
Principal amount	$ 50,000,000.0	$ 300,000,000										$ 350,000,000
Percentage of principal amount	102.00%	100.00%
Percent exchanged								100.00%
Unamortized premium												900,000
Deferred loan costs												(5,500,000)
Net proceeds from issuance of debt	$ 50,500,000
Expected percent exchanged							100.00%
Outstanding amount												$ 350,000,000