Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill — Goodwill by operating segment as of June 30, 2015 and changes for the six months then ended are as follows (in thousands):

	Contract		Pressure
	Drilling		Pumping		Total
Balance December 31, 2014	$	86,234	$	124,561	$	210,795
Changes to goodwill	—		—			—
Balance June 30, 2015	$	86,234	$	124,561	$	210,795

Gross Carrying Amount and Accumulated Amortization of Customer Relationships

The following table presents the gross carrying amount and accumulated amortization of the customer relationships as of June 30, 2015 and December 31, 2014 (in thousands):

	June 30, 2015							December 31, 2014
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	25,500	$	(17,303	)	$	8,197	$	25,500	$	(15,482	)	$	10,018