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Debt Obligations (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
May 28, 2019
May 22, 2019
Mar. 18, 2019
Dec. 31, 2018
Oct. 30, 2014
Debt Instrument [Line Items]                    
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax $ (56,863,000)   $ (4,613,000) $ (60,887,000) $ (40,198,000)          
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt   $ 71,660,000                
Repayments of Debt 49,000,000                  
Revolving Credit Facility $ 741,000     $ 741,000         $ 215,725,000  
Revolving Credit Facility, Interest Rate at Period End 1.05%     1.05%            
Document Period End Date       Sep. 30, 2019            
Debt Instrument, Face Amount           $ 1,000        
Debt Instrument, Convertible, Conversion Price $ 147.24     $ 147.24            
Repayments of Convertible Debt $ 352,400,000 94,200,000                
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.375%     1.375%            
Other Debt $ 18,811,000     $ 18,811,000         38,513,000  
Debt, Long-term and Short-term, Combined Amount 1,106,754,000     1,106,754,000         634,097,000  
Unamortized Debt Issuance Expense 20,456,000     20,456,000         6,298,000  
Debt, net of debt issuance costs 1,086,298,000     1,086,298,000         627,799,000  
Short-term debt obligations and current maturities of long-term debt obligations 18,626,000     18,626,000         38,017,000  
Debt obligations, net of current portion $ 1,067,672,000     1,067,672,000         589,782,000  
Line of Credit Facility, Expiration Date Oct. 17, 2023                  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments   $ (42,917,000)                
Stock Issued During Period, Shares, Conversion of Convertible Securities 2.5                  
Gain (Loss) on Extinguishment of Debt       (9,831,000)            
Debt Securities $ 653,940,000     653,940,000     $ 669,900,000      
0.75% Issue [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount               $ 525,000,000    
Minimum [Member]                    
Debt Instrument [Line Items]                    
Consolidated Interest Coverage Ratio 400.00%                  
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 1.125%                  
Minimum [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 0.175%                  
Maximum [Member]                    
Debt Instrument [Line Items]                    
Consolidated Total Leverage Ratio 350.00%                  
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 2.00%                  
Maximum [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate 1.00%                  
1.5% Issue [Member]                    
Debt Instrument [Line Items]                    
Convertible Debt $ 0     0         $ 379,859,000  
Debt Instrument, Convertible, Conversion Price                   $ 72.18
Interest Expense, Debt       1,500,000            
Amortization of Debt Discount (Premium)     $ 4,600,000              
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments       34,200,000            
0.75% Issue [Member]                    
Debt Instrument [Line Items]                    
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt       25,600,000            
Convertible Debt 433,262,000     433,262,000            
Debt Instrument, Convertible, Conversion Price               $ 188.73    
Interest Expense, Debt 1,000,000.0     2,100,000            
Amortization of Debt Discount (Premium) $ 3,700,000     $ 7,900,000            
Debt Instrument, Interest Rate During Period 4.40%     4.40%            
Debt Instrument, Unamortized Discount $ 91,700,000     $ 91,700,000