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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2015
$
342

 
$
6,805

 
$
7,147

Accretion
125

 
540

 
665

Amounts paid
(176
)
 
—

 
(176
)
Increases and (reductions) recorded
(55
)
 
258

 
203

Reclassifications
60

 
(60
)
 
—

Balance at December 31, 2015
296

 
7,543

 
7,839

Accretion
36

 
587

 
623

Amounts paid
(213
)
 
—

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

 
(100
)
 
—

Balance at December 31, 2016
$
85

 
$
7,472

 
$
7,557
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
2016 – January 1 through December 31 – Additions(1)
11.50
%
2016 – December 31 - Incremental Estimates(2)
12.09
%
2015 – January 1 through December 31 – Additions(1)
10.48
%
2015 – December 31 - Incremental Estimates(2)
11.50
%
2014 – January 1 through December 31 – Additions(1)
10.48
%
2014 – December 31 - Incremental Estimates(2)
12.10
%
(1) 
Transmitters moved to new sites resulting in additional liability. Weighted average credit adjusted risk-free rate used to discount additions.
(2) 
Weighted average credit adjusted risk-free rate used to discount downward revision to estimated future cash flows.