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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Oct. 31, 2017
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 911,000	$ 616,000	$ 3,447,000	$ 4,142,000
Unsecured Notes 4.0% Senior Notes Due November 2017
Debt Instrument [Line Items]
Stated interest rates (as a percent)	4.00%		4.00%		4.00%
Extinguishment of debt, amount	$ 550,000,000.0
Unsecured Notes 7.125% Senior Notes Due February 2018
Debt Instrument [Line Items]
Stated interest rates (as a percent)	7.125%		7.125%		7.125%
Extinguishment of debt, amount	$ 300,000,000.0
Unsecured Notes 4.875% Senior Notes Due July 2018
Debt Instrument [Line Items]
Stated interest rates (as a percent)	4.875%		4.875%		4.875%
Extinguishment of debt, amount	$ 300,000,000.0
Unsecured Notes
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 900,000	$ 3,100,000	$ 900,000	$ 3,100,000
Unsecured 4.625% Senior Notes Due September 2020
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000.0		$ 400,000,000.0		$ 400,000,000.0
Stated interest rates (as a percent)	4.625%	4.625%	4.625%	4.625%	4.625%
Unsecured 5.25% Senior Notes Due September 2022
Debt Instrument [Line Items]
Debt instrument, face amount	$ 400,000,000.0		$ 400,000,000.0		$ 400,000,000.0
Stated interest rates (as a percent)	5.25%	5.25%	5.25%	5.25%	5.25%
Unsecured 3.125% Senior Convertible Notes Due September 2022
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000.0		$ 250,000,000.0		$ 250,000,000.0	$ 37,500,000.0
Stated interest rates (as a percent)	3.125%	3.125%	3.125%	3.125%	3.125%	3.125%
Unsecured Notes
Debt Instrument [Line Items]
Deferred financing costs	$ 18,600,000		$ 18,600,000		$ 18,600,000

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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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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-SubTopic 50
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