XML 91 R84.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Long-Term Debt - Convertible Notes (Details)
12 Months Ended
Jul. 01, 2016
trading_day
$ / shares
shares
Nov. 19, 2013
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
Dec. 19, 2018
USD ($)
Long-Term Debt          
Face amount of debt issuance         $ 250,000,000.0
Interest rate         5.125%
Convertible Notes          
Long-Term Debt          
Face amount of debt issuance   $ 287,500,000 $ 287,500,000    
Interest rate   1.00% 1.00% 1.00%  
Net proceeds after fees and shares repurchase   $ 254,200,000      
Shares repurchased (in shares) | shares   665,994      
Fair value of debt component   $ 215,800,000      
Debt instrument, fair value of embedded option   $ 71,700,000 $ 71,700,000    
Effective interest rate percentage   5.26%      
Conversion price (in dollars per share) | $ / shares $ 52.35   $ 52.35    
Conversion ratio     0.0191022    
Shares issued (in shares) | shares 5,500,000        
Threshold percentage of share price that triggers conversion, share price in excess of conversion rate 135.00%        
Debt conversion, threshold trading days, share price in excess of conversion rate | trading_day 20        
Debt conversion, threshold consecutive trading days, share price in excess of conversion rate | trading_day 30        
Threshold percentage of share price that triggers conversion, share price below conversion rate 98.00%        
Percentage of the total voting power of all classes of common equity as defined as a fundamental change per the terms of the debt agreement 50.00%        
Amount convertible at end of period     $ 0    
Change in control conversion price, as percentage of par plus interest 100.00%