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Consolidated Financial Statement Components (Tables)
12 Months Ended
Dec. 31, 2017
Supplemental Balance Sheet Information [Abstract]  
Summary of Depreciation, Amortization and Accretion
Depreciation, amortization and accretion consisted of the following for the periods stated:
 
For the Year Ended December 31,
(Dollars in thousands)
2017
 
2016
 
2015
Depreciation
 
 
 
 
 
Leasehold improvements
$
234

 
$
189

 
$
233

Asset retirement costs
(388
)
 
(277
)
 
(505
)
Paging and computer equipment
8,024

 
7,974

 
8,489

Furniture, fixtures and vehicles
306

 
294

 
353

Total depreciation
8,176

 
8,180

 
8,570

Amortization
2,886

 
4,160

 
4,735

Accretion
562

 
623

 
665

Total depreciation, amortization and accretion expense
$
11,624

 
$
12,963

 
$
13,970

Property, Plant and Equipment
Property and equipment, net consisted of the following for the periods stated:
 
Useful Life
(In Years)
 
For the Year Ended December 31,
(Dollars in thousands)
 
2017
 
2016
Leasehold improvements
lease term
 
$
4,107

 
$
3,843

Asset retirement costs
1-5
 
3,228

 
3,263

Paging and computer equipment
1-5
 
103,520

 
113,175

Furniture, fixtures and vehicles
3-5
 
4,545

 
2,852

Total property and equipment
 
 
115,400

 
123,133

Accumulated depreciation
 
 
(102,001
)
 
(110,315
)
Total property and equipment, net
 
 
$
13,399

 
$
12,818

Components of Other Liabilities
Other current liabilities consisted of the following for the periods stated:
 
December 31,
(Dollars in thousands)
2017
 
2016
Accrued network costs, asset retirement obligations and other
2,173

 
2,168

Accrued outside services
$
2,053

 
$
1,442

Total other current liabilities
$
4,226

 
$
3,610

Summary of Other Long-Term Liabilities
Other non-current liabilities consisted of the following for the periods stated:
 
December 31,
(Dollars in thousands)
2017
 
2016
Asset retirement obligations
$
7,174

 
$
7,472

Other
901

 
1,449

Total other non-current liabilities
$
8,075

 
$
8,921