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Property Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment, Net
PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment, net is summarized as follows:
 
 
At December 31,
 
 
2016
 
2015
In thousands
 
 
 
 
Land
 
$
14,921

 
$
14,115

Buildings
 
97,265

 
93,465

Leasehold improvements
 
20,068

 
18,430

Machinery, office furniture and equipment
 
249,068

 
242,147

Construction in process
 
21,565

 
10,077

Total
 
402,887

 
378,234

Less accumulated depreciation
 
(226,366
)
 
(202,648
)
Property, plant and equipment, net
 
$
176,521

 
$
175,586



Depreciation expense was $27.5 million, $24.1 million and $23.8 million for 2016, 2015 and 2014, respectively.

The Company is currently implementing new enterprise resource planning ("ERP") systems at both its Aerospace segment and its Distribution segment. For the years ended December 31, 2016, 2015, and 2014, expenses incurred totaled approximately $2.0 million, $1.2 million and $1.1 million, respectively, and capital expenditures totaled $4.1 million, $6.4 million, and $9.8 million, respectively. Total to date ERP system capital expenditures as of December 31, 2016, were $44.6 million. Depreciation expense for the ERP systems for the years ended December 31, 2016, 2015, and 2014, totaled $3.9 million, $3.8 million and $2.6 million, respectively.

Capital Leases

For the year ended December 31, 2016, $3.6 million of assets purchased under the Company's master leasing agreement with PNC and accounted for as capital leases was included in machinery, office furniture and equipment and construction in process, with accumulated depreciation of $0.4 million. For the year ended December 31, 2015, $1.6 million of assets purchased under the Company's master leasing agreement with PNC and accounted for as capital leases was included in machinery, office furniture and equipment with accumulated depreciation of $0.1 million. Depreciation expense associated with the capital leases was $0.3 million and $0.1 million for 2016 and 2015, respectively. There was no depreciation expense associated with the capital leases in 2014. See Note 16, Commitments and Contingencies, for a discussion on the master leasing agreement.