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Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2016
Fair Value Disclosures [Abstract]  
Fair Value Measurements [Table Text Block]
 
 
 
Fair Value Measurement at
 
 
 
June 30, 2016
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
Deferred compensation trust assets (1)
$
23,176

 
$
—

 
$
23,176

 
$
—

Liabilities:
 

 
 

 
 
 
 
Deferred compensation plan
$
28,772

 
$
—

 
$
28,772

 
$
—

5 year interest rate swap
851

 
—

 
851

 
—

10 year interest rate swap
2,727

 
—

 
2,727

 
—

 
$
32,350

 
$
—

 
$
32,350

 
$
—

 
 
 
Fair Value Measurement at
 
 
 
December 31, 2015
 
Total
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
Deferred compensation trust assets (1)
$
23,737

 
$
—

 
$
23,737

 
$
—

Liabilities:
 

 
 
 
 
 
 
Deferred compensation plan
$
29,155

 
$
—

 
$
29,155

 
$
—

5 year interest rate swap
353

 
—

 
353

 
—

10 year interest rate swap
1,229

 
—

 
1,229

 
—

 
$
30,737

 
$
—

 
$
30,737

 
$
—

 
 
 
 
 
 
 
 
(1) Trust assets consist of the cash surrender value of life insurance policies intended to assist in the funding of the deferred compensation plan and are included in Other assets in the Balance Sheet.