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Debt Debt (Convertible Debt Roll Forward) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unamortized Debt Issuance Expense, January 1 $ (10,453,000)    
Convertible Debt, January 1 144,938,000    
Repayments of Convertible Debt (27,558,000)    
Amortization of Debt Issuance Costs 4,437,000 $ 5,790,000 $ 3,563,000
Debt Instrument, Unamortized Discount, December 31 (2,711,000)    
Unamortized Debt Issuance Expense, December 31 (9,884,000) (10,453,000)  
Convertible Debt, December 31 118,609,000 144,938,000  
Convertible Debt [Member]      
Debt Instrument, Face Amount, January 1 147,575,000    
Debt Instrument, Unamortized Discount, January 1 (2,637,000)    
Unamortized Debt Issuance Expense, January 1 (1,752,000)    
Amortization of Debt Discount (Premium) 788,000    
Amortization of Debt Issuance Costs 545,000    
Debt Instrument, Face Amount, December 31 120,000,000 147,575,000  
Debt Instrument, Unamortized Discount, December 31 (1,391,000) (2,637,000)  
Unamortized Debt Issuance Expense, December 31 (910,000) (1,752,000)  
Convertible Debt, Net of Debt Issuance Costs [Member]      
Convertible Debt, January 1 143,186,000    
Convertible Debt, December 31 117,699,000 $ 143,186,000  
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