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Debt Obligations, net (Secured Credit Facility Narrative) (Details)	1 Months Ended		3 Months Ended		48 Months Ended
	Mar. 31, 2016 USD ($)	Mar. 31, 2012 USD ($) tranche	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($)	Mar. 27, 2015 USD ($)
Line of Credit Facility [Line Items]
Repayments of debt			$ 282,755,000	$ 12,328,000
Loss on early extinguishment of debt, net			$ (125,000)	(168,000)
2015 Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity						$ 250,000,000.0
Line of Credit Facility, interest rate during period			3.18%
Converted term loan, term			1 year
Repayments of debt	$ 5,000,000
2015 Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Variable interest rate, spread			1.00%
2015 Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage			0.375%
2015 Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage			0.50%
2012 Secured Credit Facilities
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 880,000,000
Number of tranches | tranche		2
2012 Tranche A-1 Facility
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 410,000,000
Percentage of par credit facilities were issued at		98.00%
2012 Tranche A-1 Facility | Minimum
Line of Credit Facility [Line Items]
Variable interest rate, spread			1.25%
2012 Tranche A-2 Facility
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 470,000,000
Variable interest rate, basis			LIBOR
Variable interest rate, spread			5.75%
Percentage of par credit facilities were issued at		98.50%
Repayments of debt					$ 144,900,000
Stated interest rates	7.00%		7.00%		7.00%
Loss on early extinguishment of debt, net			$ (100,000)	$ (200,000)
2012 Tranche A-2 Facility | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Variable interest rate, spread			1.25%

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Converted Term Loan, Term

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

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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=34725769&loc=d3e28878-108400

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

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