Property, Plant and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

11. Property, Plant and Equipment

The table below sets forth the reclassification and components of property, plant and equipment as of December 31, 2016 and 2015:

(in thousands)	2016		2015		Estimated useful life
Land and land improvements	$13,339		$14,307		25 years for improvements
Buildings	214,086		211,027		25 to 40 years
Assets under capital lease	8,140		-		7 years
Machinery and equipment	842,921		828,409		5 to 15 years
Furniture and fixtures	7,632		6,074		5 years
Computer and other equipment	15,264		14,813		3 to 10 years
Software	54,212		52,503		5 to 8 years
Capital expenditures in progress	66,900		26,291
Property, plant and equipment, gross	1,222,494		1,153,424
Accumulated depreciation and amortization	(799,930	)	(795,954	)
Property, plant and equipment, net	$422,564		$357,470

In April 2016, we acquired Harris Corporation’s composite aerostructures business which increased property, plant and equipment by $62.8 million, including $8.1 million for a building under capital lease. We included amortization of the capital lease in depreciation expense. Accumulated amortization of the capital lease was $0.9 million as of December 31, 2016.

Expenditures for maintenance and repairs are charged to income as incurred and amounted to $16.6 million in 2016, $16.6 million in 2015, and $17.4 million in 2014.

Depreciation expense was $58.1 million in 2016, $53.0 million in 2015, and $56.6 million in 2014. Software amortization is recorded in Selling, general, and administrative expense and was $4.0 million in 2016, $6.5 million in 2015, and $6.2 million in 2014. Capital expenditures, including purchased software, were $78.5 million in 2016, $50.6 million in 2015, and $58.9 million in 2014. Unamortized software cost was $7.2 million and $9.6 million as of December 31, 2016 and 2015, respectively.