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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) shares in Millions		1 Months Ended			3 Months Ended		9 Months Ended
	Apr. 12, 2017	Mar. 31, 2017	Nov. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Nov. 02, 2017
Debt Instrument [Line Items]
Repayments of debt							$ 726,795,000	$ 1,065,253,000
Loss on early extinguishment of debt, net					$ 616,000	$ 36,000	4,142,000	1,618,000
4.625% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount					$ 400,000,000.0		$ 400,000,000.0
Stated interest rates (as a percent)					4.625%		4.625%
5.25% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount					$ 400,000,000.0		$ 400,000,000.0
Stated interest rates (as a percent)					5.25%		5.25%
3.125% senior convertible notes
Debt Instrument [Line Items]
Debt instrument, face amount					$ 250,000,000.0		$ 250,000,000.0
Stated interest rates (as a percent)					3.125%		3.125%
Unsecured Notes
Debt Instrument [Line Items]
Deferred financing costs					$ 17,400,000		$ 17,400,000
Loss on early extinguishment of debt, net						$ 100,000	$ 3,100,000	$ 400,000
6.00% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 375,000,000.0
Stated interest rates (as a percent)		6.00%			6.00%		6.00%
5.85% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)		5.85%			5.85%		5.85%
Repayments of debt		$ 99,700,000
9.00% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)	9.00%				9.00%		9.00%
Repayments of debt	$ 275,000,000
5.875% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)				5.875%
Repayments of debt				$ 261,400,000
6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 275,000,000
Stated interest rates (as a percent)				6.50%	6.50%		6.50%
3.875% senior notes
Debt Instrument [Line Items]
Repayments of debt				$ 265,000,000
2015 $325 Million Secured Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt				$ 5,000,000
3.00% senior convertible notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)			3.00%
Repayments of debt			$ 200,000,000
Conversion of senior unsecured convertible notes into common stock			$ 9,600,000
Shares of common stock converted (in shares)			0.8
Subsequent Event | 3.125% senior convertible notes
Debt Instrument [Line Items]
Debt instrument, face amount									$ 37,500,000

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- Definition

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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