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Senior Notes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Repayments of Long-term Lines of Credit			$ 70,000,000	$ 25,800,000
Accretion of debt discount, net of debt premium on senior notes			151,000	242,000
Convertible Notes amortization of debt issuance costs			$ 393,000	$ 189,000
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term		71 months
Debt Instrument, Interest Rate During Period	6.69%		6.69%	6.69%
Principal amount	$ 400,000,000		$ 400,000,000		$ 400,000,000
Long-term Debt, Fair Value	$ 419,900,000		$ 419,900,000
Debt Instrument, Discount Rate	6.87%		6.87%	6.87%
Senior Notes interest expense	$ 6,625,000	$ 5,383,000	$ 13,250,000	$ 10,766,000
Convertible Notes amortization of debt issuance costs	69,000	34,000	$ 136,000	68,000
Senior Notes [Member] | Senior Note One [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period			6.69%
Debt Instrument, Discount Rate			6.87%
Accretion of debt discount, net of debt premium on senior notes	$ 131,000	$ 122,000	$ 260,000	$ 242,000
Senior Notes [Member] | Senior Note Two [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	6.625%		6.625%
Debt Instrument, Interest Rate During Period			6.90%
Debt Instrument, Discount Rate			6.20%
Accretion of debt discount, net of debt premium on senior notes	$ 55,000		$ 109,000

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