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Convertible Subordinated Notes (Narrative) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
Dec. 24, 2018
USD ($)
May 31, 2018
USD ($)
May 07, 2018
USD ($)
shares
Oct. 25, 2017
$ / shares
Oct. 24, 2017
$ / shares
Mar. 19, 2014
component
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Sep. 30, 2018
$ / shares
Jun. 30, 2018
$ / shares
Mar. 31, 2018
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
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 $ 0.30 $ 0.225 $ 0.15
Deferred tax liability $ 244,000             $ 244,000       $ 244,000 $ 225,000  
Amortization of debt issuance costs                       532,000 820,000 $ 824,000
Deferred Tax Liabilities, Convertible Subordinated Notes $ 131,000             $ 131,000       131,000 4,096,000  
Interest expense                       21,109,000 12,948,000 11,738,000
Payments for Repurchase of Redeemable Convertible Preferred Stock                       $ 98,266,000 $ 0 0
Common Stock, Par or Stated Value Per Share | $ / shares $ 0.01             $ 0.01       $ 0.01 $ 0.01  
Principal amount $ 36,040,000             $ 36,040,000       $ 36,040,000    
Write off of Deferred Debt Issuance Cost     $ 700,000                 502,000 $ 0 567,000
Payment of Debt Conversion, Transaction Costs                       $ 885,000 0 0
Convertible subordinated notes                            
Debt Instrument [Line Items]                            
Interest Rate, Unamortized Debt Discount and Debt Issuance Costs, Effective Percentage 3.20%             3.20%       3.20%    
Principal amount $ 143,750,000.00             $ 143,750,000.00       $ 143,750,000.00    
Debt instrument interest rate (in percent) 2.75%           2.75% 2.75%       2.75%    
Debt conversion (in dollars per share) | $ / shares $ 22.21           $ 22.56 $ 22.21       $ 22.21    
Debt instrument, term                       7 years    
Number of recognition components, convertible debt | component             2              
Deferred tax liability $ 12,700,000             $ 12,700,000       $ 12,700,000    
Conversion ratio 45.0228           44.3169         0.0444108    
Long-term debt, fair value $ 6,200,000             $ 6,200,000       $ 6,200,000    
Interest expense                       1,900,000 4,000,000 4,000,000
Amortization of debt issuance costs                       200,000 500,000 500,000
Accretion of discount                       $ 2,200,000 $ 4,300,000 $ 3,900,000
Remaining discount amortization period                       26 months    
Interest Rate, Unamortized Debt Discount, Effective Percentage 11.40%             11.40%       11.40% 11.30%  
Convertible Subordinated Debt $ 28,800,000 $ 22,418,000.16   $ 115,000,000       $ 28,800,000       $ 28,800,000    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   78.00%   80.00%                    
Payments for Repurchase of Redeemable Convertible Preferred Stock, Principle   $ 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 $ 6,346,000             $ 6,346,000       6,346,000 $ 143,750,000  
Gain (Loss) On Repurchase Of Convertible Junior Subordinated Debentures   1,700,000   $ 1,200,000                    
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost   3,100,000                        
Write off of Deferred Debt Issuance Cost   $ 1,400,000                   700,000    
Payment of Debt Conversion, Transaction Costs                       900,000    
Component of Convertible Debt, Transaction Expense, Early Extinguishment       $ 500,000               600,000    
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt                       $ 300,000