Fair Value of Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table summarizes the financial instruments measured at fair value on a recurring basis classified in the fair value hierarchy (Level 1, 2 or 3) based on the inputs used for valuation in the accompanying consolidated balance sheets:
 
As of December 31, 2015
 
As of December 31, 2014
Assets (liabilities) in thousands
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Interest rate swaps
$
—

 
$
11,404

 
$
—

 
$
11,404

 
$
—

 
$
(4,780
)
 
$
—

 
$
(4,780
)
Foreign currency forward swaps
21,383

 
—

 
—

 
21,383

 
—

 
—

 
—

 
—

Cross currency swaps
—

 
64,083

 
—

 
64,083

 
—

 
18,183

 
—

 
18,183

Total
$
21,383

 
$
75,487

 
$
—

 
$
96,870

 
$
—

 
$
13,403

 
$
—

 
$
13,403
Schedule of Carrying Values and Estimated Fair Values of Debt
The following table presents the carrying amount and estimated fair value of our outstanding short-term and long-term debt obligations as of December 31, 2015:
 
 
As of December 31, 2015
As of December 31, 2014
(In thousands)
 
Carrying Amount
 
Fair Value
Carrying Amount
 
Fair Value
Liabilities:
 
 
 
 
 
 
 
Long-term debt, including current portion
 
$
1,295,761

 
$
1,125,124

$
524,111

 
$
524,111