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Convertible Subordinated Notes (Narrative) (Details)
 9 Months Ended 12 Months Ended
Dec. 01, 2016
$ / shares
Sep. 01, 2016
$ / shares
Jun. 01, 2016
$ / shares
Mar. 01, 2016
$ / shares
Mar. 19, 2014
component
$ / shares
Sep. 30, 2014
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
Feb. 09, 2016
USD ($)
Debt Instrument [Line Items]                    
Principal amount             $ 218,695,000      
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 50.00 $ 0.05 $ 0.025 $ 0.025     $ 0.05 $ 0.025    
Debt instrument maturity date           Mar. 15, 2021        
Deferred tax liability             $ 615,000 $ 1,436,000    
Amortization of debt issuance costs             824,000 921,000 $ 908,000  
Deferred Tax Liabilities, Convertible Subordinated Notes             8,636,000 10,184,000    
Convertible subordinated notes                    
Debt Instrument [Line Items]                    
Principal amount             $ 143,750,000 143,750,000   $ 143,750,000
Debt instrument interest rate (in percent)         2.75%          
Debt conversion (in dollars per share) | $ / shares         $ 22.56   $ 22.52      
Debt redemption price (percent)         100.00%          
Debt instrument, term             7 years      
Number of recognition components, convertible debt | component         2          
Deferred tax liability             $ 12,700,000      
Conversion ratio         0.0443169   0.0444108      
Long-term debt, fair value             $ 194,600,000      
Interest expense             4,000,000      
Amortization of debt issuance costs             500,000      
Accretion of discount             $ 3,900,000 $ 3,500,000    
Remaining discount amortization period             50 months      
Effective interest rate (percent)             2.75% 6.75%