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Convertible Senior Notes, Net - Summary of Terms of Notes (Details) - Convertible Debt [Member]		12 Months Ended
	Oct. 05, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2014 USD ($)	Mar. 17, 2014 USD ($)
Debt Instrument [Line Items]
Principal Amount		$ 609,482,000
Conversion rate basis, principal amount		1,000
2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount				$ 254,800,000.0	$ 34,482,000
Coupon Rate				5.50%
Effective Rate				8.31%
Conversion Rate				0.0582442
Remaining Period of Amortization				2 months 15 days
2022 Notes [Member]
Debt Instrument [Line Items]
Principal Amount			$ 345,000,000.0
Coupon Rate			4.75%
Effective Rate			5.60%
Conversion Rate			0.0502260
Remaining Period of Amortization			3 years 7 months 23 days
2023 Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 230,000,000	$ 230,000,000.0
Coupon Rate	5.375%
Effective Rate	6.16%
Conversion Rate	0.0487187
Remaining Period of Amortization	4 years 9 months 15 days

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