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

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Balance Sheet Account Detail (Financial Instruments Not Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Aug. 09, 2018	Nov. 02, 2015
Debt Instrument [Line Items]
Carrying value	$ 192,687	$ 182,666
Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument, stated interest rate			3.25%
Convertible Senior Notes Due 2020 \| Convertible notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate				3.25%
Level 3
Debt Instrument [Line Items]
Carrying value	192,687	182,666
Fair value	157,181	157,856
Level 3 \| Term loan facility
Debt Instrument [Line Items]
Carrying value	143,301	141,274
Fair value	115,765	131,892
Level 3 \| Convertible notes
Debt Instrument [Line Items]
Carrying value	35,293	37,111
Fair value	30,247	24,548
Level 3 \| Other debt
Debt Instrument [Line Items]
Carrying value	14,093	4,281
Fair value	$ 11,169	$ 1,416