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Debt Obligations, net (Narrative) (Details) - USD ($)	1 Months Ended				12 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2019	Oct. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net					$ 27,724,000	$ 10,367,000	$ 14,724,000
6.00% senior notes
Debt Instrument [Line Items]
Stated interest rate (percent)		6.00%			6.00%
6.50% senior notes
Debt Instrument [Line Items]
Stated interest rate (percent)		6.50%			6.50%
2016 Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)					1.00%
Unsecured 4.75 Senior Notes Due October 2024
Debt Instrument [Line Items]
Stated interest rate (percent)		4.75%			4.75%
4.25% senior notes
Debt Instrument [Line Items]
Stated interest rate (percent)		4.25%			4.25%
4.625% senior notes
Debt Instrument [Line Items]
Stated interest rate (percent)		4.625%			4.625%
5.25% senior notes
Debt Instrument [Line Items]
Stated interest rate (percent)		5.25%			5.25%
3.125% senior convertible notes
Debt Instrument [Line Items]
Stated interest rate (percent)		3.125%			3.125%		3.125%
Secured Debt | 2016 Senior Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount				$ 650,000,000.0
Periodic principal payment (as a percent)					0.25%
Secured Debt | 2016 Senior Term Loan | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)				2.75%	2.75%
Secured Debt | 2016 Senior Term Loan | LIBOR | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)					1.75%
Secured Debt | 2015 $350 Million Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount		$ 350,000,000			$ 350,000,000
Maximum borrowing capacity			$ 350,000,000.0
Secured Debt | 2015 $350 Million Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage			0.25%
Current borrowing capacity		$ 350,000,000.0			$ 350,000,000.0
Secured Debt | 2015 $350 Million Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage			0.45%
Secured Debt | 2015 $350 Million Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)					2.25%
Secured Debt | 2015 $350 Million Revolving Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)			2.00%		1.00%
Secured Debt | 2015 $350 Million Revolving Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)			2.50%
Secured Debt | 2015 $350 Million Revolving Credit Facility | Base Rate | Minimum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)			1.00%
Secured Debt | 2015 $350 Million Revolving Credit Facility | Base Rate | Maximum
Debt Instrument [Line Items]
Basis point spread on variable interest rate (percent)			1.50%
Secured Debt | Other expense | 2016 Senior Term Loan
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net						2,500,000	$ 800,000
Unsecured Notes
Debt Instrument [Line Items]
Loss on early extinguishment of debt, net					$ 26,600,000	$ 1,200,000	$ 13,600,000
Unsecured Notes | 6.00% senior notes
Debt Instrument [Line Items]
Stated interest rate (percent)		6.00%			6.00%
Principal amount called for redemption		$ 375,000,000.0
Unsecured Notes | 6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 275,000,000.0
Stated interest rate (percent)			6.50%
Unsecured Notes | Unsecured 4.75 Senior Notes Due October 2024
Debt Instrument [Line Items]
Debt instrument, face amount			$ 675,000,000.0					$ 100,000,000.0
Percentage of par credit facilities were issued at								102.00%
Yield to maturity								4.29%
Stated interest rate (percent)			4.75%					4.75%
Unsecured Notes | 4.25% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 550,000,000.0			$ 550,000,000.0
Stated interest rate (percent)		4.25%			4.25%
Unsecured Notes | 4.625% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 400,000,000.0
Stated interest rate (percent)			4.625%
Unsecured Notes | 3.125% senior convertible notes
Debt Instrument [Line Items]
Debt instrument, face amount									$ 37,500,000
Yield to maturity		5.20%			5.20%	5.20%	5.20%
Stated interest rate (percent)		3.125%			3.125%	3.125%				3.125%
Subsequent Event | Unsecured Notes | 6.00% senior notes
Debt Instrument [Line Items]
Principal amount called for redemption	$ 110,500,000

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