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DEBT (Other Long-term Debt) (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Aug. 15, 2017
USD ($)
Jul. 24, 2017
USD ($)
Mar. 10, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
May 23, 2016
USD ($)
Nov. 25, 2015
EUR (€)
Mar. 13, 2015
USD ($)
Mar. 03, 2015
EUR (€)
Sep. 23, 2014
EUR (€)
Mar. 31, 2012
USD ($)
Debt Instrument                                        
Amortization of debt discount     $ 69,734,000 $ 68,974,000 $ 66,687,000                              
1.00% Convertible Senior Notes Due March 2018                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               1.00% 1.00%       1.00% 1.00%           1.00%
Senior notes face amount                                       $ 1,000,000,000
Payments of debt issuance costs             $ 20,900,000                          
Debt Instrument, Interest Rate, Effective Percentage                                       3.50%
0.8% Senior Notes Due March 2022                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               0.80% 0.80%     0.80%                
Senior notes face amount | €               € 1,000,000,000       € 1,000,000,000                
Unamortized Debt Discount | €                       € 2,100,000                
Payments of debt issuance costs     5,000,000                                  
Debt Instrument, Interest Rate, Effective Percentage                       0.84%                
2.15% Senior Notes Due November 2022                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               2.15% 2.15%       2.15% 2.15%   2.15%        
Senior notes face amount | €               € 750,000,000         € 750,000,000     € 750,000,000        
Unamortized Debt Discount | €                               € 2,200,000.0        
Payments of debt issuance costs         3,700,000                              
Debt Instrument, Interest Rate, Effective Percentage                                 2.20%      
2.75% Senior Notes Due March 2023                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               2.75% 2.75% 2.75%                    
Senior notes face amount                   $ 500,000,000                    
Unamortized Debt Discount                   $ 700,000                    
Payments of debt issuance costs     2,700,000                                  
Debt Instrument, Interest Rate, Effective Percentage                   2.78%                    
2.375% Senior Notes Due September 2024                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               2.375% 2.375%       2.375% 2.375%         2.375%  
Senior notes face amount | €               € 1,000,000,000         € 1,000,000,000           € 1,000,000,000  
Unamortized Debt Discount | €                                     € 9,400,000  
Payments of debt issuance costs           $ 6,500,000                            
Debt Instrument, Interest Rate, Effective Percentage                                     2.48%  
3.65% Senior Notes Due March 2025                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               3.65% 3.65%       3.65% 3.65%     3.65%      
Senior notes face amount                                 $ 500,000,000      
Unamortized Debt Discount                                 $ 1,300,000.0      
Payments of debt issuance costs         3,200,000                              
Debt Instrument, Interest Rate, Effective Percentage                                 3.68%      
3.6% Senior Notes Due June 2026                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               3.60% 3.60%       3.60% 3.60% 3.60%          
Senior notes face amount                             $ 1,000,000,000          
Unamortized Debt Discount                             $ 1,900,000          
Payments of debt issuance costs       6,200,000                                
Debt Instrument, Interest Rate, Effective Percentage                             3.62%          
1.8% Senior Notes Due March 2027                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               1.80% 1.80%       1.80% 1.80%       1.80%    
Senior notes face amount | €               € 1,000,000,000         € 1,000,000,000         € 1,000,000,000    
Unamortized Debt Discount | €                                   € 300,000.0    
Payments of debt issuance costs         6,300,000                              
Debt Instrument, Interest Rate, Effective Percentage                                   1.80%    
3.55% Senior Notes Due March 2028                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               3.55% 3.55% 3.55%                    
Senior notes face amount                   $ 500,000,000                    
Unamortized Debt Discount                   $ 400,000                    
Payments of debt issuance costs     3,200,000                                  
Debt Instrument, Interest Rate, Effective Percentage                   3.56%                    
Other Long-term Debt [Member]                                        
Debt Instrument                                        
Interest Expense, Debt     144,800,000 108,000,000 61,500,000                              
Debt Instrument, Coupon Interest Expense     138,900,000 104,100,000 59,000,000                              
Amortization of debt discount     2,100,000 1,500,000 1,100,000                              
Amortization of debt issuance costs included in interest expense     $ 3,800,000 $ 2,400,000 $ 1,400,000                              
1% CT Loan Due March 2016 [Member]                                        
Debt Instrument                                        
Interest rate stated percentage (as a percent)               1.00% 1.00%       1.00% 1.00%            
Senior notes face amount $ 2,500,000               $ 1,500,000         $ 2,500,000            
State of Connecticut loan term 10 years                                      
Amount of State of Connecticut loan forgiven   $ 1,000,000                                    
Momondo Group [Member]                                        
Debt Instrument                                        
Debt assumed in acquisition(s)                     $ 15,100,000