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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22(a)(1))
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Senior Notes, Secured, and Unsecured Indebtedness - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Aug. 11, 2014	Mar. 31, 2014	Nov. 08, 2012
Debt Instrument [Line Items]
Deferred loan costs	$ 12,100
Notes payable	$ 239,390	$ 175,181
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%
8 1/2% and 7% Senior Notes
Debt Instrument [Line Items]
Unamortized premium	$ 4,200
Senior notes \| 8 1/2% Senior Notes due November 15, 2020
Debt Instrument [Line Items]
Stated interest rate	8.50%				8.50%
Unamortized premium	$ 3,300
Deferred loan costs	$ 5,400
Senior notes \| 7% Senior Notes due August 15, 2022
Debt Instrument [Line Items]
Stated interest rate	7.00%		7.00%
Unamortized premium	$ 900
Deferred loan costs	$ 5,200
Senior notes \| 5 3/4% Senior Notes due April 15, 2019
Debt Instrument [Line Items]
Stated interest rate	5.75%			5.75%
Deferred loan costs	$ 1,400
Seller financing
Debt Instrument [Line Items]
Notes payable	$ 29,439	$ 0