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Convertible Subordinated Notes Convertible Subordinated Notes (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
May 31, 2018
USD ($)
May 07, 2018
USD ($)
shares
Mar. 19, 2014
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Debt Instrument [Line Items]                  
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.01       $ 0.01   $ 0.01   $ 0.01
Interest Expense, Debt             $ 7,200,000    
Amortization of Debt Issuance Costs             420,000 $ 614,000  
Write off of Deferred Debt Issuance Cost   $ 700,000              
Gain (Loss) on Repurchase of Debt Instrument             845,000 0  
Interest Expense         $ 6,285,000 $ 3,282,000 14,763,000 9,517,000  
Payments for Repurchase of Redeemable Convertible Preferred Stock             75,229,000 0  
Convertible Subordinated Notes [Member]                  
Debt Instrument [Line Items]                  
Convertible Preferred Stock, Shares Issued upon Conversion | shares     2,822,859            
Convertible subordinated notes, principal amount $ 28,764,000   $ 115,000,000 $ 143,750,000 $ 28,764,000   $ 28,764,000   $ 143,750,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed     80.00%            
Stated interest rate percentage 2.75%     2.75% 2.75%   2.75%    
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures     $ 1,200,000            
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost     2,500,000            
Debt Instrument, Convertible, Conversion Ratio 44.8913     44.3169          
Long-term Debt, Fair Value $ 31,900,000       $ 31,900,000   $ 31,900,000    
Interest Expense, Debt         200,000 1,000,000 1,700,000 3,000,000  
Amortization of Debt Issuance Costs         27,000 130,000 200,000 400,000  
Accretion of discount, convertible subordinated notes         $ 200,000 $ 1,100,000 $ 2,000,000 $ 3,200,000  
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 22.28     $ 22.56 $ 22.28   $ 22.28    
Effective interest rate percentage 3.15%       3.15% 11.36% 3.15% 11.36%  
Write off of Deferred Debt Issuance Cost     1,300,000   $ 700,000   $ 700,000    
Gain (Loss) on Repurchase of Debt Instrument     800,000            
Component of Convertible Debt, Transaction Expense, Early Extinguishment     500,000            
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle     74,800,000            
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt     300,000            
Interest Expense     400,000            
Payments for Repurchase of Redeemable Convertible Preferred Stock     $ 75,200,000