Property, plant and equipment consisted of the following (dollars in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

December 31,

 

 

    

 

2016

    

2015

 

Land

 

 

$

67,278

 

$

67,278

 

Buildings

 

 

 

115,775

 

 

114,351

 

Central office equipment

 

 

 

208,004

 

 

194,707

 

Outside communications plant

 

 

 

412,244

 

 

377,042

 

Other equipment, vehicles and furniture

 

 

 

87,849

 

 

74,377

 

Construction in progress

 

 

 

55,606

 

 

32,595

 

Software

 

 

 

78,547

 

 

66,704

 

Other

 

 

 

10,834

 

 

10,873

 

Property, plant and equipment cost

 

 

 

1,036,137

 

 

937,927

 

Less accumulated depreciation

 

 

 

440,140

 

 

358,820

 

 

 

 

$

595,997

 

$

579,107