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Borrowings (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2012
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
item
$ / shares
Dec. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Feb. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
USD ($)
Borrowings                  
Borrowings outstanding   $ 149,000   $ 149,000   $ 113,000      
Components of long-term debt                  
Term loans   1,321   1,321   2,114      
Other long-term debt   2,031   2,031   1,658      
Total   255,291   255,291   251,242      
Less current portion of long-term debt   (2,107)   (2,107)   (2,262)      
Long-term portion of debt   253,184   253,184   248,980      
Revolving Credit Facility                  
Borrowings                  
Maximum borrowing capacity               $ 525,000 $ 450,000
Sub limit available for letters of credit   300,000   $ 300,000          
Unused commitment fee (as a percent)       0.20%          
Borrowings outstanding   149,000   $ 149,000          
Amount outstanding under lines of credit facilities   58,900   58,900          
Available credit facility   317,100   $ 317,100          
Revolving Credit Facility | Minimum                  
Borrowings                  
Unused commitment fee (as a percent)       0.20%          
Revolving Credit Facility | Maximum                  
Borrowings                  
Increase in the credit agreement's borrowing capacity available under certain circumstances   250,000   $ 250,000          
Unused commitment fee (as a percent)       0.30%          
Revolving Credit Facility | LIBOR                  
Borrowings                  
Interest rate margin (as a percent)       1.50%          
Revolving Credit Facility | LIBOR | Minimum                  
Borrowings                  
Interest rate margin (as a percent)       1.25%          
Revolving Credit Facility | LIBOR | Maximum                  
Borrowings                  
Interest rate margin (as a percent)       2.00%          
1.25% Convertible Senior Notes Due 2022                  
Borrowings                  
Principal amount   $ 287,500   $ 287,500     $ 287,500    
Interest rate (as a percentage)   1.25%   1.25%     1.25%    
Conversion ratio       9.3056          
Conversion price | $ / shares   $ 107.46   $ 107.46          
Premium on stock price   38.50%   38.50%          
Threshold percentage of stock price       130.00%          
Number of trading days | item       20          
Number of consecutive trading days | item       30          
Principal amount of the notes to be repurchased (as a percentage)       100.00%          
Liability component of convertible debt   $ 242,400   $ 242,400          
Equity component of convertible debt   45,100   45,100          
Debt issuance costs   7,700   7,700          
Debt Component of debt issuance costs   6,500   6,500          
Equity component of debt issuance costs   1,200   1,200          
Total interest expense   3,200 $ 3,100 6,300 $ 6,100        
Contractual interest expense   900 900 1,800 3,700        
Amortization of debt discount   2,000 1,900 3,900 1,800        
Amortization of debt issuance costs   300 $ 300 600 $ 600        
Unamortized debt discount   $ 31,251   $ 31,251   35,133      
Effective interest rate (as a percent)   4.50%   4.50%          
Unamortized debt issuance costs   $ 4,310   $ 4,310   4,897      
Stock price per share | $ / shares   $ 73.30   $ 73.30          
Components of long-term debt                  
Principal amount   $ 287,500   $ 287,500   287,500      
Unamortized discount   (31,251)   (31,251)   (35,133)      
Unamortized debt issuance costs   (4,310)   (4,310)   (4,897)      
Total   251,939   251,939   247,470      
Bank lines of credit                  
Borrowings                  
Amount outstanding under lines of credit facilities   61,600   61,600          
Available credit facility   6,700   6,700          
Seven-year term loan due in fiscal 2020                  
Borrowings                  
Borrowings outstanding   $ 1,300   $ 1,300   $ 2,100      
Principal amount $ 11,100                
Effective interest rate (as a percent) 2.20%                
Term of loan 7 years                
Seven-year term loan due in fiscal 2020 | LIBOR                  
Borrowings                  
Interest rate margin (as a percent) 1.25%