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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Interest expense on convertible debt        
Total interest expense     $ 5,630 $ 4,853
Convertible Notes, Credit and Amended and Restated Credit Agreements        
Interest expense on convertible debt        
Interest on revolving credit facility $ 1,429 $ 1,110 3,994 2,455
Accretion of debt discount 2,411 1,344 3,829 2,681
Coupon interest 1,366 754 2,121 1,509
Amortization of issuance costs 621 616 1,071 2,046
Undrawn and other fees 165 53 213 122
Total interest expense $ 5,992 $ 3,877 $ 11,228 $ 8,813