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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net assets of acquired businesses. Goodwill is not amortized, but is evaluated for impairment on an annual basis, or more frequently if impairment indicators arise.

Goodwill by reportable operating segment, as described in Note 14 - Segment Information, was approximately $42.4 million and $8.7 million for Housekeeping and Dietary, respectively, as of December 31, 2017. At December 31, 2016, goodwill by reportable operating segment was $42.4 million and $2.1 million for Housekeeping and Dietary, respectively. The increase in goodwill is related to the acquisition of certain Dietary-related assets during 2017.

Intangible Assets

The Company’s intangible assets consist of customer relationships which were obtained through acquisitions and are recorded at their fair values at the date of acquisition. Intangible assets with determinable lives are amortized on a straight-line basis over their estimated useful lives. The customer relationships have a weighted-average amortization period of 9.9 years. The increase from the prior year is due to the acquisition of certain Dietary-related assets during 2017.

The following table sets forth the estimated amortization expense for intangibles subject to amortization for the next five years and thereafter:
Period/Year
 
Total Amortization Expense
 
(in thousands)
2018
 
$
4,364

2019
 
$
4,165

2020
 
$
4,165

2021
 
$
4,165

2022
 
$
4,165

Thereafter
 
$
9,859



Amortization expense for the years ended December 31, 2017, 2016 and 2015 was $3.9 million, $2.7 million and $3.2 million, respectively.