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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Apr. 30, 2016	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015
Debt Instrument [Line Items]
Repayments of debt			$ 282,755	$ 12,328
Borrowings from debt obligations			$ 275,000	$ 250,000
5.875% senior notes
Debt Instrument [Line Items]
Repayments of debt		$ 261,400
Stated interest rates		5.875%	5.875%
6.50% senior notes
Debt Instrument [Line Items]
Stated interest rates		6.50%	6.50%
Borrowings from debt obligations			$ 275,000
2015 Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt		$ 5,000
3.875% senior notes
Debt Instrument [Line Items]
Stated interest rates		3.875%	3.875%
3.875% senior notes | Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 265,000

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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- Definition

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