Annual report pursuant to Section 13 and 15(d)

Debt (Int) (Details)

v3.8.0.1
Debt (Int) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest expense on convertible debt      
Total interest expense $ 8,994 $ 8,244 $ 10,271
Convertible Notes, Credit and Amended and Restated Credit Agreements      
Interest expense on convertible debt      
Coupon interest 3,019 3,019 3,019
Amortization of issuance costs 3,279 2,875 1,462
Accretion of debt discount 5,472 5,237 4,932
Interest on credit agreement 4,153 5,128 606
Undrawn and other fees 424 341 252
Total interest expense 16,347 16,600 10,271
Convertible Notes      
Interest expense on convertible debt      
Accretion of debt discount $ 5,472 $ 5,237 $ 4,932