Property, Plant and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property, plant and equipment consist of the following (in thousands):



	December 31,
	2018			2017
Land	$	17,608		$	17,846
Buildings and leasehold improvements	138,126			106,316
Furniture and equipment	240,080			202,897
	395,814			327,059
Accumulated depreciation	(158,824		)	(130,814		)
	236,990			196,245
Construction in progress	97,863			117,173
Property, plant and equipment, net	$	334,853		$	313,418

At December 31, 2018 and 2017, property, plant and equipment carrying a net book value of $91.9 million and $82.8 million, respectively, was located outside the United States.

The 2018 increase in Property, Plant and Equipment is due primarily to spending for compliance with Drug Supply Chain Security Act ("DSCSA") requirements and expansion and modernization initiatives at our Decatur and Somerset manufacturing plants.

At December 31, 2018, the Company had $97.9 million of assets under construction which consisted primarily of investment in building expansions, equipment, and compliance with DSCSA. Depreciation will begin on these assets once they are placed into service. The Company assesses its long-lived assets, consisting primarily of property and equipment, for impairment when material events and changes in circumstances indicate that the carrying value may not be recoverable. For the year ended December 31, 2018, the Company recorded impairment losses of $6.1 million. No impairment losses were recorded in 2017. During 2018, the Company capitalized interest into PP&E in the amount of $6.3 million.

Depreciation expense was $29.3 million, $23.7 million and $22.2 million for the years ended December 31, 2018, 2017 and 2016, respectively.