XML 44 R23.htm IDEA: XBRL DOCUMENT v3.8.0.1
Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Changes in Asset Retirement Obligation Liability Balances
The components of the changes in the asset retirement obligation liabilities for the periods stated were as follows:
(Dollars in thousands)
Short-Term Portion
 
Long-Term Portion
 
Total
Balance at January 1, 2016
$
296

 
$
7,543

 
$
7,839

Accretion
36

 
587

 
623

Amounts paid
(213
)
 
—

 
(213
)
Reductions
(134
)
 
(558
)
 
(692
)
Reclassifications
100

 
(100
)
 
—

Balance at December 31, 2016
85

 
7,472

 
7,557

Accretion
8

 
554

 
562

Amounts paid
(248
)
 
—

 
(248
)
Increases and reductions
5

 
(468
)
 
(463
)
Reclassifications
384

 
(384
)
 
—

Balance at December 31, 2017
$
234

 
$
7,174

 
$
7,408
Schedule of Accretion Discount Rates on Interest Method
Accretion expense related solely to asset retirement obligations and was recorded based on the interest method utilizing the following discount rates for the specified periods: 
Period
Discount Rate
 
2017 – January 1 through September 30 – Additions(2)
11.50
%
 
2017 – December 31 Additions(2) and Incremental Estimates
14.00
%
 
2016 – January 1 through December 31 – Additions(2)
11.50
%
 
2016 – December 31 - Incremental Estimates
12.09
%
(1) 
2015 – January 1 through September 30 – Additions(2)
10.48
%
 
2015 – December 31 Additions(2) and Incremental Estimates
11.50
%
 
(1) 
Weighted average credit adjusted risk-free rate used to discount downward revision to estimated future cash flows.
(2) 
Transmitters moved to new sites resulting in additional liability.