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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2018
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]  
Fair value assets and liabilities measured on recurring basis
The following tables provide a summary of the Company’s significant financial assets and liabilities carried at fair value and measured on a recurring basis as of June 30, 2018 and December 31, 2017 (in thousands):
 
 
 
 
Fair Value Measurements at June 30, 2018
 
Carrying Value at June 30, 2018
 
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Assets:
 
 
 
 
 
 
 
Restricted investment:
 
 
 
 
 
 
 
    Rabbi Trust
$
22,253

 
$
—

 
$
22,253

 
$
—

Fixed income securities
1,839

 
—

 
1,839

 
—

Liabilities:
 
 
 
 
 
 
 
Interest rate swap derivatives
$
10,445

 
$
—

 
$
10,445

 
$
—

 
 
 
 
Fair Value Measurements at December 31, 2017
 
Carrying Value at December 31, 2017
 
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other
Observable  Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Assets:
 
 
 
 
 
 
 
Restricted investments:
 
 
 
 
 
 
 
    Rabbi Trust
$
20,763

 
$
—

 
$
20,763

 
$
—

Fixed income securities
1,902

 
—

 
1,902

 
—

Liabilities:
 
 
 
 
 
 
 
Interest rate swap derivatives
$
13,992

 
$
—

 
$
13,992

 
$
—