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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
Total debt at December 31 consisted of the following (in thousands):
 
2017
 
2016
2016 Facility
$
1,270,000

 
$
1,930,000

$400 million 1.850% senior notes due 2017

 
400,000

$800 million 2.050% senior notes due 2018
800,000

 
800,000

$500 million 6.250% senior notes due 2019
500,000

 
500,000

$600 million 3.000% senior notes due 2020
600,000

 
600,000

$500 million 2.800% senior notes due 2021
500,000

 
500,000

$500 million 3.125% senior notes due 2022
500,000

 
500,000

$300 million 3.850% senior notes due 2025
300,000

 
300,000

$700 million 3.800% senior notes due 2026
700,000

 
700,000

Other
3,149

 
2,989

Less unamortized debt issuance costs
(17,594
)
 
(23,453
)
Total debt
5,155,555

 
6,209,536

Less current portion, net of issuance costs
800,944

 
400,975

Long-term debt
$
4,354,611

 
$
5,808,561

Future Maturities of Long-Term Debt
Future maturities of total debt during each of the next five years ending December 31 and thereafter were as follows (in thousands):
2018
$
801,503

2019
501,061

2020
600,529

2021
1,770,047

2022
500,009

Thereafter
1,000,000

Total
$
5,173,149