Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill by Operating Segment

Goodwill — Goodwill by operating segment as of March 31, 2019 and changes for the three months then ended are as follows (in thousands):

	Contract		Other
	Drilling		Operations		Total
Balance at beginning of period	$	395,060		15,696	$	410,756
Changes to goodwill		—		2,104		2,104
Balance at end of period	$	395,060	$	17,800	$	412,860

Gross Carrying Amount and Accumulated Amortization of Intangible Assets

Intangible Assets — The following table presents the gross carrying amount and accumulated amortization of the intangible assets as of March 31, 2019 and December 31, 2018 (in thousands):

	March 31, 2019							December 31, 2018
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	28,000	$	(12,967	)		15,033	$	28,000	$	(10,719	)	$	17,281
Developed technology		55,772		(7,927	)		47,845		55,772		(6,533	)		49,239
Favorable drilling contracts		-		-			-		22,500		(22,500	)		-
Internal use software		482		(142	)		340		482		(118	)		364
	$	84,254	$	(21,036	)	$	63,218	$	106,754	$	(39,870	)	$	66,884