Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill by Operating Segment

Goodwill — Goodwill by operating segment as of June 30, 2017 and changes for the six months then ended are as follows (in thousands):

	Contract		Pressure
	Drilling		Pumping		Total
Balance at beginning of period	$	86,234	$	—	$	86,234
Changes to goodwill		300,819		137,647		438,466
Balance at end of period	$	387,053	$	137,647	$	524,700

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 June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017							December 31, 2016
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	25,500	$	(24,589	)	$	911	$	25,500	$	(22,768	)	$	2,732
Favorable drilling contracts		22,500		(7,838	)		14,662		—		—			—
	$	48,000	$	(32,427	)	$	15,573	$	25,500	$	(22,768	)	$	2,732