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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Assets and liabilities measured at fair value on recurring basis
The table below presents the balances of assets and liabilities measured at fair value as of December 31, 2017 and December 31, 2016 on a recurring basis as well as the fair values of other financial instruments:
(In thousands)
 
 
 
 
December 31, 2017
 
December 31, 2016
 
Consolidated Balance Sheet Level
Fair Value Hierarchy Level
 
Carrying Value
Fair 
Value
 
Carrying Value
Fair 
Value
Financial assets (liabilities) measured on a recurring basis:
 
 
 
 
 
 
 
 
 
Short-term investments
 
Other current assets
Level 1
 
$
736

$
736

 
—

—

Interest rate swap agreements not designated as cash flow hedges
 
Derivative Liability
Level 2
 
$
(8,722
)
$
(8,722
)
 
$
(17,721
)
$
(17,721
)
Other financial assets (liabilities):
 
 
 
 




 




March 2013 term debt
 
Long-Term Debt (1)
Level 2
 
—

—

 
$
(600,075
)
$
(603,075
)
April 2017 term debt
 
Long-Term Debt (1)
Level 2
 
$
(735,000
)
$
(742,350
)
 
—

—

March 2013 notes
 
Long-Term Debt (1)
Level 1
 
—

—

 
$
(500,000
)
$
(510,000
)
June 2014 notes
 
Long-Term Debt (1)
Level 1
 
$
(450,000
)
$
(469,125
)
 
$
(450,000
)
$
(462,375
)
April 2017 notes
 
Long-Term Debt (1)
Level 2
 
$
(500,000
)
$
(525,000
)
 
—

—


(1)
Carrying values of long-term debt balances are before reductions of debt issuance costs of $24.5 million and $15.9 million as of December 31, 2017 and December 31, 2016, respectively.