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Property and Equipment
9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment

Property and equipment consisted of the following:
 
 
 
As of
 
As of
 
Useful life
 
September 30, 2018
 
December 31, 2017
Non-communications:
 
 
 
 
 
Computer equipment and software
1-5 years
 
$
146,831

 
124,708

Building and building improvements
5-48 years
 
49,128

 
24,003

Office furniture and equipment
1-10 years
 
22,445

 
15,210

Leasehold improvements
1-15 years
 
9,310

 
7,759

Transportation equipment
4-10 years
 
4,447

 
3,813

Land
 
3,328

 
2,628

Construction in progress
 
2,073

 
4,127

 
 
 
237,562

 
182,248

Accumulated depreciation - non-communications
 
 
(119,535
)
 
(105,017
)
Non-communications, net property and equipment
 
 
118,027

 
77,231

 
 
 
 
 
 
Communications:
 
 
 
 
 
Network plant and fiber
5-15 years
 
195,015

 
138,122

Customer located property
5-10 years
 
19,146

 
13,767

Central office
5-15 years
 
13,584

 
10,754

Transportation equipment
4-10 years
 
6,379

 
5,759

Computer equipment and software
1-5 years
 
4,988

 
3,790

Other
1-39 years
 
2,669

 
2,516

Land
 
70

 
70

Construction in progress
 
11,364

 
11,620

 
 
 
253,215

 
186,398

Accumulated depreciation - communications
 
 
(31,512
)
 
(15,578
)
Communications, net property and equipment
 
 
221,703

 
170,820

Total property and equipment, net
 
 
$
339,730

 
248,051



The Company recorded depreciation expense on its property and equipment of $15.1 million and $7.7 million during the three months ended September 30, 2018 and 2017, respectively, and $41.1 million and $20.6 million during the nine months ended September 30, 2018 and 2017, respectively.

As part of integrating technology and becoming more efficient and effective in meeting borrower needs, the Company continues to evaluate the best use of its servicing systems on a post-Great Lakes acquisition basis.  As a result of this evaluation, during the three months ended September 30, 2018, the Company recorded an impairment charge of $3.9 million within its Loan Servicing and Systems operating segment related to certain external software development costs that were previously capitalized. The impairment charge is included in "other expenses" on the Company's consolidated statements of income for the three and nine months ended September 30, 2018. There were no impairment charges recognized for the three and nine months ended September 30, 2017.