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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Interest expense on convertible debt        
Total interest expense     $ 12,337 $ 8,711
Convertible Notes, Credit and Amended and Restated Credit Agreements        
Interest expense on convertible debt        
Interest on revolving credit facility $ 0 $ 1,088 3,994 3,543
Accretion of debt discount 3,587 1,393 7,416 4,074
Coupon interest 2,264 755 4,385 2,264
Amortization of issuance costs 849 483 1,920 2,529
Undrawn and other fees 220 139 433 261
Total interest expense $ 6,920 $ 3,858 $ 18,148 $ 12,671