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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Repayments of debt				$ 1,065,253	$ 430,048
Borrowings from debt obligations				696,401	549,000
Loss on early extinguishment of debt, net		$ 36	$ 67	$ 1,618	$ 279
5.875% senior notes
Debt Instrument [Line Items]
Repayments of debt	$ 261,400
Stated interest rates	5.875%	5.875%		5.875%
6.50% senior notes
Debt Instrument [Line Items]
Stated interest rates	6.50%	6.50%		6.50%
Borrowings from debt obligations	$ 275,000
3.875% senior notes
Debt Instrument [Line Items]
Repayments of debt	265,000
Stated interest rates		3.875%		3.875%
2015 $250 Million Secured Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt	$ 5,000			$ 245,000
1.50% senior convertible notes
Debt Instrument [Line Items]
Repayments of debt		$ 21,800
Stated interest rates		1.50%		1.50%
Unsecured Debt
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net		$ 100		$ 400

X

- 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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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