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Convertible Subordinated Notes (Narrative) (Details)
 9 Months Ended 12 Months Ended
Mar. 19, 2014
USD ($)
component
$ / shares
Sep. 30, 2014
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]          
Principal amount     $ 208,466,000    
Debt instrument maturity date   Mar. 15, 2021      
Payment of debt issuance costs     0 $ 4,650,000 $ 0
Deferred tax liability     1,436,000 1,448,000  
Amortization of debt issuance costs     921,000 908,000 $ 362,000
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 (shares per $1,000) 0.0443169        
Debt conversion (in dollars per share) | $ / shares $ 22.56        
Debt redemption price (percent) 100.00%        
Payment of debt issuance costs $ 4,700,000        
Debt instrument, term 7 years   7 years    
Number of recognition components, convertible debt | component 2        
Deferred tax liability     $ 12,700,000    
Long-term debt, fair value     170,500,000    
Interest expense     4,000,000    
Amortization of debt issuance costs     500,000    
Accretion of discount     $ 3,500,000    
Remaining discount amortization period     62 months    
Effective interest rate (percent)     6.75%