Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill by Operating Segment

Goodwill — Goodwill by operating segment as of September 30, 2014 and changes for the nine months then ended are as follows (in thousands):

	Contract		Pressure
	Drilling		Pumping		Total
Balance December 31, 2013	$	86,234	$	67,575	$	153,809
Changes to goodwill	—			15,485		15,485
Balance September 30, 2014	$	86,234	$	83,060	$	169,294

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 September 30, 2014 and December 31, 2013 (in thousands):

	September 30, 2014							December 31, 2013
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	25,500	$	(14,571	)	$	10,929	$	25,500	$	(11,839	)	$	13,661