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Debt Obligations, Convertible Senior Unsecured Notes (Details) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended				12 Months Ended
	Nov. 30, 2019 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) item shares	Dec. 31, 2017 USD ($)
Debt Obligations
Cash paid for the exchange of convertible notes						$ 231,940	$ 228,287
(Loss) gain on extinguishment of debt		$ (7,311)	$ (128)	$ (82)	$ (4,960)	(7,439)	(5,041)	$ 7,116
Total		4,678,863				4,678,863
Convertible Senior Unsecured Notes
Debt Obligations
Principal amount		300,914		270,057		$ 300,914	$ 270,057
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed						100.00%
Maturity period (in years)						2 years 8 months 1 day	2 years 5 months 27 days
Unamortized Debt Discount		9,235		8,229		$ 9,235	$ 8,229
Unamortized Deferred Financing Fees		7,527		7,060		7,527	7,060
Total		$ 284,152		$ 254,768		284,152	254,768
Net Carrying Value, Equity Component						9,962	9,436
Interest expense						28,300	21,100
Interest expense related to cash coupon						13,500	13,400
Debt discount						7,900	2,900
Deferred fees expensed as interest expense						$ 6,800	$ 4,800
Cost of the notes (as a percent)		6.80%		7.45%		6.80%	7.45%
5.375% Convertible Notes
Debt Obligations
Principal amount		$ 1,100				$ 1,100
Interest rate (as a percent)		5.375%		5.375%		5.375%	5.375%
Debt instrument conversion rate						5.375%
5.375% Convertible Notes | First Offering
Debt Obligations
Conversion rate of the notes to common stock, per $1,000 principal amount of notes						107.7122
Conversion price per share of common stock | $ / shares		$ 9.28				$ 9.28
5.375% Convertible Notes | Second Offering
Debt Obligations
Conversion rate of the notes to common stock, per $1,000 principal amount of notes						114.6568
Conversion price per share of common stock | $ / shares		$ 8.72				$ 8.72
6.50% Convertible Notes
Debt Obligations
Interest rate (as a percent)				6.50%			6.50%
Cash paid for the exchange of convertible notes							$ 99,800
5.25% Convertible Notes
Debt Obligations
Interest rate (as a percent)		5.25%		5.25%		5.25%	5.25%
Cash paid for the exchange of convertible notes						$ 228,700	$ 127,600
Number of private placements | item							2
4.75% Convertible Notes
Debt Obligations
Principal amount	$ 264,000
Interest rate (as a percent)	4.75%
Proceeds received, net of estimated issuance costs						256,500
Conversion rate of the notes to common stock, per $1,000 principal amount of notes	56.1695
Conversion price per share of common stock | $ / shares	$ 17.80
4.75% Convertible Notes | Over-Allotment Option
Debt Obligations
Principal amount	$ 34,000
4.75% and 5.25% Convertible Notes
Debt Obligations
Cash paid for the exchange of convertible notes						$ 233,100
Common stock exchanged (in shares) | shares						4,478,315
(Loss) gain on extinguishment of debt						$ 7,300
Inducement charge						1,100
5.25% and 5.375% Convertible Notes
Debt Obligations
Cash paid for the exchange of convertible notes							$ 219,800
Common stock exchanged (in shares) | shares							6,820,196
(Loss) gain on extinguishment of debt							$ 5,000
Inducement charge							1,100
Junior subordinated notes
Debt Obligations
Principal amount		$ 154,336		$ 154,336		154,336	154,336
(Loss) gain on extinguishment of debt								$ 7,100
Deferred fees expensed as interest expense						2,000	$ 2,100
Issued on July 3, 2018 | 5.25% Convertible Notes
Debt Obligations
Principal amount		$ 11,500				$ 11,500
Interest rate (as a percent)		5.25%				5.25%
Debt instrument conversion rate						5.25%
Issued on July 3, 2018 | 5.25% Convertible Notes | First Offering
Debt Obligations
Conversion rate of the notes to common stock, per $1,000 principal amount of notes						86.9943
Conversion price per share of common stock | $ / shares		$ 11.50				$ 11.50
Issued on July 3, 2018 | 5.25% Convertible Notes | Second Offering
Debt Obligations
Conversion rate of the notes to common stock, per $1,000 principal amount of notes						89.2795
Conversion price per share of common stock | $ / shares		$ 11.20				$ 11.20
Issued on July 20, 2018 | 5.25% Convertible Notes
Debt Obligations
Principal amount		$ 24,300				$ 24,300
Interest rate (as a percent)		5.25%				5.25%
Debt instrument conversion rate						5.25%
Issued on July 20, 2018 | 5.25% Convertible Notes | First Offering
Debt Obligations
Conversion rate of the notes to common stock, per $1,000 principal amount of notes						77.8331
Conversion price per share of common stock | $ / shares		$ 12.85				$ 12.85
Issued on July 20, 2018 | 5.25% Convertible Notes | Second Offering
Debt Obligations
Conversion rate of the notes to common stock, per $1,000 principal amount of notes						79.8777
Conversion price per share of common stock | $ / shares		$ 12.52				$ 12.52

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