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Debt Debt (Convertible Debt Roll Forward) (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Unamortized Debt Issuance Expense, December 31 $ (10,453,000)  
Convertible Debt, December 31 144,938,000  
Repayments of Convertible Debt (29,985,000) $ (14,312,000)
Debt Instrument, Unamortized Discount, June 30 (2,922,000)  
Unamortized Debt Issuance Expense, June 30 (10,503,000)  
Convertible Debt, June 30 118,418,000  
Convertible Debt [Member]    
Debt Instrument, Face Amount, December 31 147,575,000  
Debt Instrument, Unamortized Discount, December 31 (2,637,000)  
Unamortized Debt Issuance Expense, December 31 (1,752,000)  
Amortization of Debt Discount (Premium) 597,000  
Amortization of Debt Issuance Costs 415,000  
Debt Instrument, Face Amount, June 30 120,000,000  
Debt Instrument, Unamortized Discount, June 30 (1,582,000)  
Unamortized Debt Issuance Expense, June 30 (1,040,000)  
Convertible Debt, Net of Debt Issuance Costs [Member]    
Convertible Debt, December 31 143,186,000  
Convertible Debt, June 30 117,378,000  
Allocated to Debt [Member]    
Repayments of Convertible Debt (27,575,000)  
Unamortized Debt Discount, Debt Redemption, Allocation 458,000  
Unamortized Debt Issuance Costs, Debt Redemption, Allocation $ 297,000