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Debt Obligations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 18, 2019
Dec. 31, 2018
Oct. 17, 2018
Oct. 30, 2014
Debt Instrument [Line Items]                  
Debt Instrument, Convertible, Conversion Price $ 147.24     $ 147.24          
Repayments of Other Long-term Debt       $ 446,702 $ 51,199        
Debt Instrument, Redemption Price, Percentage 100.00%                
Unamortized Debt Issuance Expense $ 20,456     20,456     $ 6,298    
Total Debt [Roll Forward]                  
Revolving Credit Facility 741     741     215,725    
Other Debt $ 18,811     $ 18,811     38,513    
Line of Credit Facility, Expiration Date Oct. 17, 2023                
Repayments of Convertible Debt $ 352,400 $ 94,200              
1.5% Issue [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Convertible, Conversion Price                 $ 72.18
Debt Instrument, Interest Rate, Stated Percentage 1.50%     1.50%          
Total Debt [Roll Forward]                  
Convertible Debt $ 0     $ 0     $ 379,859    
Interest Expense, Debt       1,500          
Amortization of Debt Discount (Premium)     $ 4,600            
0.75% Issue [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Convertible, Conversion Price           $ 188.73      
Debt Instrument, Convertible, Carrying Amount of Equity Component           $ 99,700      
Total Debt [Roll Forward]                  
Convertible Debt 433,262     433,262          
Interest Expense, Debt 1,000     2,100          
Amortization of Debt Discount (Premium) $ 3,700     $ 7,900          
Debt Instrument, Interest Rate During Period 4.40%     4.40%          
Debt Instrument, Unamortized Discount $ 91,700     $ 91,700          
Unsecured Debt [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity               $ 1,000,000  
Base Rate [Member] | Minimum [Member]                  
Total Debt [Roll Forward]                  
Debt Instrument, Basis Spread on Variable Rate 0.175%                
Base Rate [Member] | Maximum [Member]                  
Total Debt [Roll Forward]                  
Debt Instrument, Basis Spread on Variable Rate 1.00%                
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Total Debt [Roll Forward]                  
Debt Instrument, Basis Spread on Variable Rate 1.125%                
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Total Debt [Roll Forward]                  
Debt Instrument, Basis Spread on Variable Rate 2.00%