Quarterly report pursuant to Section 13 or 15(d)

Debt (Int) (Details)

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Debt (Int) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Interest expense on convertible debt    
Total interest expense $ 2,013 $ 2,356
Convertible Notes, Credit and Amended and Restated Credit Agreements    
Interest expense on convertible debt    
Coupon interest 755 755
Amortization of issuance costs 725 241
Accretion of debt discount 1,286 1,210
Interest on credit agreement 1,262  
Undrawn and other fees 64 150
Total interest expense $ 4,092 $ 2,356