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Business Acquisitions (Tables)
12 Months Ended
Dec. 31, 2018
Business Combinations [Abstract]  
Summary of purchase price allocation based on estimated fair values of acquired assets and liabilities as of the acquisition date
The following table summarizes the purchase price allocation based on the estimated fair values of the acquired assets as of the acquisition date (in thousands):
 
Fair Value
Property, plant and equipment
$
14,929

Intangible assets
3,839

Purchase price
$
18,768

Schedule of amount of finite life intangible assets, and their associated average useful lives
The amount of acquired finite-life intangible assets and their average useful lives were determined based on the period over which the assets are expected to contribute directly or indirectly to our future cash flows and consisted of the following (dollars in thousands):
 
Amount
 
Average Useful Life
Contract-based intangible assets
$
3,839

 
2.3 years