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Debt Obligations (Details Textual)
$ / shares in Units, $ in Thousands, € in Millions, shares in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 17, 2020
Mar. 18, 2019
USD ($)
$ / shares
Dec. 31, 2018
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Sep. 04, 2019
USD ($)
May 22, 2019
EUR (€)
May 22, 2019
USD ($)
Oct. 17, 2018
USD ($)
Debt Instrument [Line Items]                            
Redemptions and conversions of convertible notes, net of tax           $ (20,467)                
Repayments of Convertible Debt       $ 94,200                    
Repayments of Debt       $ 49,000                    
Senior Notes | €             € 600   € 600          
Unamortized debt issuance costs               $ (13,729)   $ (17,932)        
Due in 2022               800            
Due in 2023               283,500            
Long-term Debt, Maturities, Repayments of Principal in Year Five               468,200            
thereafter               $ 682,100            
Line of Credit Facility, Interest Rate Description       <span style="border-left: none; border-right: none;">LIBOR</span> plus <span style="border-left: none; border-right: none;">0.65</span>%                    
Letter of credit, interest rate at period end             1.10% 1.10%            
Letters of credit outstanding, amount               $ 84,200            
Conversion price | $ / shares   $ 188.73           $ 147.24            
Debt Instrument, Face Amount               $ 1,000            
Debt Instrument, Convertible, Effective Interest Rate       4.40%                    
Debt Instrument, Convertible, Interest Expense           3,100                
Other debt, current               $ 900   900        
Debt Instrument, Redemption Price, Percentage   100.00%                        
Issuance of convertible notes, net of tax           71,659                
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate             1.375% 1.375%       1.375% 1.375%  
Senior notes               $ 682,100   682,100   € 600 $ 669,900  
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares       2.5                    
Gain (Loss) on Extinguishment of Debt, before Tax         $ 9,800                  
Debt instrument, description       (i) as of the end of each fiscal quarter ended on March 31, September 30 and December 31, a Consolidated Total Leverage Ratio not to be greater than 3.5 to 1.0; (ii) as of the end of each fiscal quarter ended on June 30, a Consolidated Total Leverage Ratio (as defined in the Credit Facility) not to be greater than 4.0 to 1.0; provided that, not more than two times prior to the expiration date, that a Material Acquisition has been consummated, for any period of four consecutive fiscal quarters following such Material Acquisition, the Consolidated Total Leverage Ratio will be not greater than 4.0 to 1.0 for fiscal quarters ended on March 31, September 30 and December 31 and not greater than 4.5 to 1.0 for fiscal quarters ended on June 30; provided, further, that following such four consecutive fiscal quarters for which the maximum Consolidated Total Leverage Ratio is increased, the maximum Consolidated Total Leverage Ratio shall revert to the levels set forth in clauses (i) and (ii) above for not fewer than two fiscal quarters before a subsequent Increase Notice is delivered to the syndicate of financial institutions; and (iii) a Consolidated Interest Coverage Ratio (as defined in the Credit Facility) not less than 4.0 to 1.0. Subject to meeting certain leverage ratio and liquidity requirements as contained in the unsecured credit agreement, the Company is permitted to pay dividends, repurchase common stock and repurchase subordinated debt.                    
Debt instrument, redemption, description       (i) on or after September 20, 2022 if the closing sale price of the Company's Common Stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption and (ii) on or after March 20, 2025 and prior to the maturity date, regardless of the foregoing sale price condition, in each case at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the Convertible Notes. In addition, if a fundamental change, as defined in the Indenture, occurs prior to the maturity date, holders may require the Company to repurchase for cash all or part of their Convertible Notes at a repurchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date.                    
Cash               1,000            
Principal amount of retired convertible notes               352,400            
Consolidated interest coverage ratio, description Under the Amendment, the Consolidated Total Leverage Ratio, as defined in the Credit Facility, was modified to reduce the amount of consolidated funded debt by the amount of cash and cash equivalents on the Company's consolidated balance sheet and the Consolidated Interest Coverage Ratio now includes a one-time option to reduce the ratio to 3.5 to 1.0 from 4.0 to 1.0 for a period of up to three consecutive quarters.                          
Accretion Expense       $ 16,000 15,300 11,600                
Other Obligation Arrangements               800            
Retired Convertible Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Redemption Price, Percentage   100.00%                        
Senior Notes, 1.375 Percent due 2026 [Member]                            
Debt Instrument [Line Items]                            
Unamortized debt issuance costs               $ (5,400)            
Debt Instrument, Convertible, Effective Interest Rate       1.375%                    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate             1.375% 1.375%            
Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity               $ 689,300            
Letters of credit outstanding, amount               57,300   60,800        
Line of Credit [Member] | Letter of Credit [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity               200,000            
Common Stock [Member]                            
Debt Instrument [Line Items]                            
Cash               352,400            
Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Redemptions and conversions of convertible notes, net of tax           34,200                
Amortization of Debt Discount (Premium)         4,600                  
Debt Instrument, Convertible, Interest Expense         1,500                  
Senior notes               682,080   $ 732,840        
Due 2049 [Member]                            
Debt Instrument [Line Items]                            
Redemptions and conversions of convertible notes, net of tax           $ 25,600                
Debt Instrument, Convertible, Carrying Amount of Equity Component               $ 99,700            
Debt Issuance Costs, Gross   $ 12,800                        
Debt Instrument, Face Amount   $ 525,000                        
Debt Instrument, Interest Rate, Stated Percentage             1.50% 1.50%            
Debt Instrument, Unamortized Discount               $ 56,800            
Debt Instrument, Convertible, Effective Interest Rate       0.75%                    
Debt Instrument, Convertible, Interest Expense       $ 3,900 $ 3,900                  
U.S. dollar swingline loans [Member] | Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity               50,000            
Foreign currencies swingline loans [Member] | Line of Credit [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity               $ 90,000            
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate     1.125%                      
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate     2.00%                      
Base rate [Member] | Minimum [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate     0.175%                      
Base rate [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate     1.00%                      
Unsecured Debt [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                           $ 1,000,000
Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Long-term Debt, Weighted Average Interest Rate, at Point in Time             1.20% 1.20%            
BofA LoC [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                     $ 100,000