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Long-Term Debt - Revolving Credit and Convertible Notes (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Nov. 19, 2013
USD ($)
shares
Sep. 30, 2018
USD ($)
item
$ / shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jul. 28, 2014
USD ($)
Long-Term Debt          
Repayment of outstanding borrowings   $ 569,017 $ 827,351    
Revolving Credit Facility          
Long-Term Debt          
Maximum borrowing capacity   400,000      
Sublimit for swingline loans   50,000      
Sublimit for letters of credit   30,000      
Amount outstanding   $ 30,900      
Weighted average interest rate, as a percent   3.00%   3.20%  
Accordion Provision Under Credit Facility [Member]          
Long-Term Debt          
Maximum borrowing capacity   $ 500,000      
Letter of Credit [Member]          
Long-Term Debt          
Amount outstanding   7,200      
Senior Notes 5.125 Percent Due 2022          
Long-Term Debt          
Face amount of debt issuance   $ 250,000     $ 250,000
Interest rate, as a percentage   5.125%   5.125%  
Restricted assets   $ 0      
Convertible Senior Notes 1.00 percent due 2020          
Long-Term Debt          
Face amount of debt issuance   $ 287,500      
Interest rate, as a percentage   1.00%   1.00%  
Net proceeds after fees and shares repurchase $ 254,200        
Shares repurchased | shares 665,994        
Fair value of debt component $ 215,800        
Debt instrument, fair value of embedded option $ 71,700        
Principal balance   $ 287,500   $ 287,500  
Effective interest rate percentage 5.26%        
Conversion price (in dollars per share) | $ / shares   $ 52.35      
Conversion ratio per $1 principal amount   0.0191022      
Number of shares to be received upon conversion of debt | item   5,500,000      
Threshold percentage of share price that triggers conversion   135.00%      
Debt conversion, threshold trading days | item   20      
Debt conversion, threshold consecutive trading days | item   30      
Debt Instrument, Convertible, Consecutive Trading Days Available for Conversion   10 days      
Debt Instrument, Convertible, Threshold Consecutive Trading Days   5 days      
Debt Instrument, Convertible, Threshold Percentage of Conversion   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%      
Minimum | Credit Agreement          
Long-Term Debt          
Total net leverage ratio, debt covenant   1.50      
Minimum | Revolving Credit Facility | Alternative Base Rate Loans And Canadian Prime Rate Loans [Member]          
Long-Term Debt          
Margin (as a percent)   0.00%      
Minimum | Revolving Credit Facility | Adjusted LIBOR Loans, Canadian Dealer Offered Rate Loans And Bank Bill Swap Reference Rate Loans [Member]          
Long-Term Debt          
Margin (as a percent)   1.00%      
Minimum | Revolving Credit Facility | Johannesburg Interbank Agreed Rate Loans [Member]          
Long-Term Debt          
Margin (as a percent)   1.25%      
Maximum | Credit Agreement          
Long-Term Debt          
Senior secured net leverage ratio, debt covenant   2.25      
Total net leverage ratio, debt covenant   4.00      
Total net leverage ratio related to restricted payments   3.00      
Maximum | Revolving Credit Facility | Alternative Base Rate Loans And Canadian Prime Rate Loans [Member]          
Long-Term Debt          
Margin (as a percent)   1.25%      
Maximum | Revolving Credit Facility | Adjusted LIBOR Loans, Canadian Dealer Offered Rate Loans And Bank Bill Swap Reference Rate Loans [Member]          
Long-Term Debt          
Margin (as a percent)   2.25%      
Maximum | Revolving Credit Facility | Johannesburg Interbank Agreed Rate Loans [Member]          
Long-Term Debt          
Margin (as a percent)   2.50%