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Convertible Subordinated Notes (Narrative) (Details)
 3 Months Ended 12 Months Ended
Apr. 04, 2019
USD ($)
Dec. 24, 2018
USD ($)
May 07, 2018
USD ($)
shares
Oct. 25, 2017
$ / shares
Oct. 24, 2017
$ / shares
Mar. 19, 2014
component
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Sep. 30, 2019
$ / shares
Jun. 30, 2019
$ / shares
Mar. 31, 2019
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Debt Instrument [Line Items]                          
Common Stock, Dividends, Per Share, Declared | $ / shares       $ 0.075 $ 0.05   $ 0.075 $ 0.075 $ 0.075 $ 0.075 $ 0.300 $ 0.300 $ 0.225
Debt instrument, term                     77 months    
Deferred tax liability             $ 289,000       $ 289,000 $ 244,000  
Amortization of debt issuance costs                     392,000 532,000 $ 820,000
Deferred Tax Liabilities, Convertible Subordinated Notes             $ 75,000       75,000 131,000  
Interest expense                     25,522,000 21,109,000 12,948,000
Payments for Repurchase of Redeemable Convertible Preferred Stock                     $ 27,000 $ 98,266,000 0
Common Stock, Par or Stated Value Per Share | $ / shares             $ 0.01       $ 0.01 $ 0.01  
Principal amount             $ 90,764,000       $ 90,764,000    
Net loss on early extinguishment of debt                     0 $ 502,000 0
Payment of Debt Conversion, Transaction Costs                     $ 0 885,000 0
Convertible subordinated notes                          
Debt Instrument [Line Items]                          
Interest Rate, Unamortized Debt Discount and Debt Issuance Costs, Effective Percentage             3.20%       3.20%    
Principal amount             $ 143,750,000.00       $ 143,750,000.00    
Debt instrument interest rate (in percent)           2.75%              
Debt conversion (in dollars per share) | $ / shares           $ 22.56 $ 22.00       $ 22.00    
Debt instrument, term                     7 years    
Number of recognition components, convertible debt | component           2              
Deferred tax liability             $ 12,700,000       $ 12,700,000    
Conversion ratio           44.3169         45.4615    
Long-term debt, fair value             $ 7,800,000       $ 7,800,000    
Interest expense                     200,000 1,900,000 4,000,000
Amortization of debt issuance costs                     24,000 245,000 517,000
Accretion of discount                     $ 200,000 $ 2,200,000 $ 4,300,000
Interest Rate, Unamortized Debt Discount, Effective Percentage             11.40%       11.40% 11.30%  
Convertible Subordinated Debt $ 25,000 $ 22,418,000.16 $ 115,000,000                    
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle $ 27,163 22,900,000 74,800,000                    
Interest expense   200,000 400,000                    
Payments for Repurchase of Redeemable Convertible Preferred Stock   23,000,000 $ 75,200,000                    
Convertible Preferred Stock, Shares Issued upon Conversion | shares     2,822,859                    
Principal amount             $ 6,319,000       $ 6,319,000 $ 6,346,000  
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures   1,700,000                      
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost   3,100,000                      
Net loss on early extinguishment of debt   $ 1,400,000                      
Payment of Debt Conversion, Transaction Costs                     900,000    
Component of Convertible Debt, Transaction Expense, Early Extinguishment                     600,000    
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt                     $ 300,000