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PROPERTY, PLANT & EQUIPMENT (FY)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT & EQUIPMENT
6.   PROPERTY, PLANT & EQUIPMENT
 
The major classes of depreciable assets are as follows:
 
  December 31, 
In thousands 2017  2016 
Machinery and equipment $728,257  $645,354 
Buildings and improvements  259,561   225,307 
Land and improvements  38,228   41,569 
Property, plant and equipment
  1,026,046   912,230 
Less: accumulated depreciation  (452,074)  (393,854)
Total
 $573,972  $518,376 

The estimated useful lives of property, plant and equipment are as follows:
 
 
Years
Land improvements          
10 to 20
Building and improvements          
20 to 40
Machinery and equipment          
3 to 15
 
Depreciation expense was $66.7 million, $47.1 million, and $43.1 million for 2017, 2016 and 2015, respectively.