Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill — Goodwill by operating segment as of December 31, 2019 and 2018 and changes for the years then ended are as follows (in thousands):

	Contract		Pressure			Directional			Other
	Drilling		Pumping			Drilling			Operations			Total
Balance, December 31, 2017	$	395,060	$	121,444		$	88,685		$	6,284		$	611,473
Goodwill acquired		—		—			—			9,412			9,412
Measurement period adjustment		—		—			1,000			—			1,000
Impairment		—		(121,444	)		(89,685	)		—			(211,129	)
Balance, December 31, 2018	$	395,060	$	—		$	—		$	15,696		$	410,756
Measurement period adjustment		—		—			—		$	2,104			2,104
Impairment		—		—			—			(17,800	)		(17,800	)
Balance, December 31, 2019	$	395,060	$	—		$	—		$	—		$	395,060

The following table identifies the segment and weighted average useful life of each of the Company’s intangible assets:

		Weighted Average
	Segment	Useful Life
		(in years)
Customer relationships	Directional drilling	3.00
Customer relationships	Other operations	7.00
Developed technology	Directional drilling	5.22
Favorable drilling contracts	Contract drilling	0.83
Internal use software	Directional drilling	5.00

The gross carrying amount and accumulated amortization of intangible assets as of December 31, 2019 and 2018 are as follows (in thousands):

	2019							2018
	Gross Carrying		Accumulated			Net Carrying		Gross Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	28,000	$	(19,710	)	$	8,290	$	28,000	$	(10,719	)	$	17,281
Developed technology		55,772		(15,386	)		40,386		55,772		(6,533	)		49,239
Favorable drilling contracts		—		—			—		22,500		(22,500	)		—
Internal use software		482		(214	)		268		482		(118	)		364
	$	84,254	$	(35,310	)	$	48,944	$	106,754	$	(39,870	)	$	66,884

The remaining amortization expense associated with finite-lived intangible assets is expected to be as follows (in thousands):