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Debt Obligations, net (Unsecured Notes Narrative) (Details) - USD ($) shares in Millions		1 Months Ended			3 Months Ended
	Apr. 12, 2017	Mar. 31, 2017	Nov. 30, 2016	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Repayments of debt					$ 353,191,000	$ 282,755,000
6.00% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 375,000,000.0			$ 375,000,000.0
Stated interest rates (as a percent)		6.00%			6.00%
5.85% senior notes
Debt Instrument [Line Items]
Repayments of debt		$ 99,700,000
Stated interest rates (as a percent)		5.85%			5.85%
9.00% senior notes
Debt Instrument [Line Items]
Stated interest rates (as a percent)		9.00%			9.00%
5.875% senior notes
Debt Instrument [Line Items]
Repayments of debt				$ 261,400,000
Stated interest rates (as a percent)				5.875%		5.875%
6.50% senior notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 275,000,000		$ 275,000,000
Stated interest rates (as a percent)		6.50%		6.50%	6.50%	6.50%
3.875% senior notes
Debt Instrument [Line Items]
Repayments of debt				$ 265,000,000
2015 $250 Million Secured Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, face amount		$ 250,000,000			$ 250,000,000
Repayments of debt				$ 5,000,000
3.00% senior convertible notes
Debt Instrument [Line Items]
Repayments of debt			$ 200,000,000
Stated interest rates (as a percent)			3.00%
Conversion of senior unsecured convertible notes into common stock			$ 9,600,000
Shares of common stock converted (in shares)			0.8
Subsequent Event | 9.00% senior notes
Debt Instrument [Line Items]
Repayments of debt	$ 275,000,000
Stated interest rates (as a percent)	9.00%

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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

+ References

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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