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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($)			1 Months Ended	3 Months Ended
	Oct. 20, 2017	Apr. 12, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Oct. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Repayments of debt				$ 349,658,000	$ 353,458,000
4.625% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 400,000,000.0
Stated interest rates (as a percent)				4.625%			4.625%
5.25% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 400,000,000.0
Stated interest rates (as a percent)				5.25%			5.25%
3.125% senior convertible notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 37,500,000					$ 37,500,000	$ 250,000,000.0
Stated interest rates (as a percent)	3.125%			3.125%		3.125%	3.125%
Unsecured Notes
Debt Instrument [Line Items]
Deferred financing costs							$ 18,600,000
6.00% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 375,000,000.0		$ 375,000,000.0
Stated interest rates (as a percent)			6.00%	6.00%	6.00%
5.85% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)			5.85%		5.85%
Repayments of debt			$ 99,700,000
9.00% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)		9.00%
Repayments of debt		$ 275,000,000
Unsecured Notes Four Percent Senior Notes Due November 2017
Debt Instrument [Line Items]
Stated interest rates (as a percent)	4.00%
Extinguishment of debt, amount	$ 550,000,000.0
Unsecured Notes Seven Point One Two Five Percent Senior Notes Due February 2018
Debt Instrument [Line Items]
Stated interest rates (as a percent)	7.125%
Extinguishment of debt, amount	$ 300,000,000.0
Unsecured Notes 4 point 875 Percent Senior Notes Due July 2018
Debt Instrument [Line Items]
Stated interest rates (as a percent)	4.875%
Extinguishment of debt, amount	$ 300,000,000.0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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