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 |
| X | ||||||||||
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of amortization expense attributable to debt issuance costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of commitment fees for the unused borrowing capacity under the long-term financing arrangement that is available to the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Aggregate amount of interest paid or due on all long-term debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|