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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2016
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 September 30, 2016 and December 31, 2015 (in thousands):
 
 
 
 
Fair Value Measurements at September 30, 2016
 
Carrying Value at September 30, 2016
 
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Assets:
 
 
 
 
 
 
 
Restricted investment:
 
 
 
 
 
 
 
    Rabbi Trust
$
15,521

 
$
—

 
$
15,521

 
$
—

Fixed income securities
1,848

 
—

 
1,848

 
—

Liabilities:
 
 
 
 
 
 
 
Interest rate swap derivatives
$
26,896

 
$
—

 
$
26,896

 
$
—

 
 
 
 
Fair Value Measurements at December 31, 2015
 
Carrying
Value at
December 31, 2015
 
Quoted Prices in
Active Markets
(Level 1)
 
Significant Other
Observable  Inputs
(Level 2)
 
Significant
Unobservable
Inputs (Level 3)
Assets:
 
 
 
 
 
 
 
Restricted investments:
 
 
 
 
 
 
 
    Rabbi Trust
$
13,071

 
$
—

 
$
13,071

 
$
—

Fixed income securities
1,717

 
—

 
1,717

 
—

       Interest rate cap derivatives
93

 
—

 
93

 
—

Liabilities:
 
 
 
 
 
 
 
Interest rate swap derivatives
$
20,835

 
$
—

 
$
20,835

 
$
—