Quarterly report pursuant to Section 13 or 15(d)

Debt (Interest) (Details)

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Debt (Interest) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Interest expense on convertible debt    
Total interest expense $ 3,209 $ 3,522
Convertible Notes, Credit and Amended and Restated Credit Agreements    
Interest expense on convertible debt    
Interest on revolving credit facility 2,565 1,345
Accretion of debt discount 1,418 1,337
Coupon interest 755 755
Amortization of issuance costs 450 1,430
Undrawn and other fees 48 69
Total interest expense $ 5,236 $ 4,936