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FAIR VALUE MEASUREMENTS (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Measurement Information for Certain Assets and Liabilities
The following table provides fair value measurement information for certain assets and liabilities as of June 30, 2018 and December 31, 2017:
 
 
June 30, 2018
 
December 31, 2017
(in thousands)
 
Book
Value
 
Fair
Value
 
Book
Value
 
Fair
Value
Financial Assets (Liabilities):
 
 

 
 
 
 
 
 

4.375% Notes due 2024
 
$
(750,000
)
 
$
(758,228
)
 
$
(750,000
)
 
$
(797,010
)
3.90% Notes due 2027
 
$
(750,000
)
 
$
(721,763
)
 
$
(750,000
)
 
$
(767,813
)
Derivative instruments — assets
 
$
75,273

 
$
75,273

 
$
17,237

 
$
17,237

Derivative instruments — liabilities
 
$
(101,991
)
 
$
(101,991
)
 
$
(46,334
)
 
$
(46,334
)