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Debt Obligations, net (Secured Credit Facility Narrative) (Details)		1 Months Ended				12 Months Ended			45 Months Ended
	Mar. 27, 2015 USD ($)	Jun. 30, 2014 USD ($)	Nov. 30, 2013 USD ($)	May. 31, 2013 USD ($)	Mar. 31, 2012 USD ($) tranche	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Jun. 10, 2014 USD ($)	Nov. 13, 2013 USD ($)
Line of Credit Facility [Line Items]
Repayment of principal amount						$ 432,383,000	$ 1,471,174,000	$ 1,984,102,000
Loss on early extinguishment of debt, net						$ (281,000)	(25,369,000)	(33,190,000)
2015 Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 250,000,000.0
Line of credit facility, interest rate						3.13%
Converted loan, term						1 year
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%
Variable interest rate, spread						4.00%
2012 Tranche A-1 Facility | Minimum | London Interbank Offered Rate (LIBOR)
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
Percentage of par credit facilities were issued at					98.50%
Variable interest rate, spread						5.75%
Repayment of principal amount									$ 130,300,000
Loss on early extinguishment of debt, net						$ (300,000)	(1,500,000)	(1,000,000)
Stated interest rate						7.00%			7.00%
Variable interest rate, basis						LIBOR
2012 Tranche A-2 Facility | Minimum
Line of Credit Facility [Line Items]
Variable interest rate, spread						1.25%
2013 Revolving Credit Facility
Line of Credit Facility [Line Items]
Repayment of principal amount		$ 1,320,000,000
2013 Revolving Credit Facility | Early Repayment
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt, net							$ 22,800,000
4.00% senior notes
Line of Credit Facility [Line Items]
Debt instrument, face amount										$ 550,000,000
Stated interest rate						4.00%			4.00%	4.00%
5.00% senior notes
Line of Credit Facility [Line Items]
Debt instrument, face amount										$ 770,000,000
Stated interest rate						5.00%			5.00%	5.00%
1.50% senior convertible notes
Line of Credit Facility [Line Items]
Debt instrument, face amount											$ 200,000,000
Stated interest rate						1.50%			1.50%		1.50%
Unsecured Notes 5.70% Percent Senior Notes Due March 2014
Line of Credit Facility [Line Items]
Repayment of principal amount			$ 200,600,000
Loss on early extinguishment of debt, net								(2,800,000)
Stated interest rate											5.70%
Unsecured Notes 3.875 Percent Senior Notes Due July 2016
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 265,000,000
Stated interest rate				3.875%		3.875%			3.875%
Unsecured Notes 4.875 Percent Senior Notes Due July 2018
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 300,000,000
Stated interest rate				4.875%		4.875%			4.875%
Unsecured Notes 8.625 Percent Senior Notes Due June 2013
Line of Credit Facility [Line Items]
Repayment of principal amount				$ 96,800,000
Stated interest rate				8.625%
Unsecured Notes 5.95 Percent Senior Notes Due October 2013
Line of Credit Facility [Line Items]
Repayment of principal amount				$ 448,500,000
Loss on early extinguishment of debt, net								$ (9,500,000)
Stated interest rate				5.95%

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