Property, Plant and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment

Property, Plant and Equipment

Note 8 Property, Plant and Equipment

The major components of our property, plant and equipment are as follows:

	December 31,
	2017		2016
	(In thousands)
Land	$	52,000	$	46,319
Buildings		134,318		115,502
Drilling, workover and well-servicing rigs, and related equipment		12,997,470		12,638,749
Marine transportation and supply vessels		4,377		—
Oilfield hauling and mobile equipment		272,384		274,137
Other machinery and equipment		172,674		181,069
Oil and gas properties		12,286		12,286
Construction-in-process (1)		284,348		288,673
	$	13,929,857	$	13,556,735
Less: accumulated depreciation and amortization		(7,820,292)		(7,289,152)
	$	6,109,565	$	6,267,583

(1) Relates primarily to amounts capitalized for new or substantially new drilling rigs and related equipment that were under construction and had not yet been placed in service as of December 31, 2017 or 2016.

Depreciation expense included in depreciation and amortization expense in our consolidated statements of income (loss) totaled $835.9 million, $885.4 million and $951.4 million during 2017,  2016 and 2015, respectively.

Repair and maintenance expense included in direct costs in our consolidated statements of income (loss) totaled $241.4 million, $151.4 million and $304.7 million during 2017,  2016 and 2015, respectively.

Interest costs of $2.5 million, $6.7 million and $20.4 million were capitalized during 2017,  2016 and 2015, respectively.