Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill — Goodwill by operating segment as of December 31, 2014 and 2013 and changes for the years then ended are as follows (in thousands):

	Contract		Pressure
	Drilling		Pumping		Total

Balance December 31, 2012	$	86,234	$	67,575	$	153,809
Changes to goodwill	—		—			-
Balance December 31, 2013		86,234		67,575		153,809
Changes to goodwill	—			56,986		56,986
Balance December 31, 2014	$	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 December 31, 2014 and 2013 (in thousands):

	2014							2013
	Gross Carrying		Accumulated			Net Carrying		Gross Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount

Customer relationships	$	25,500	$	(15,482	)	$	10,018	$	25,500	$	(11,839	)	$	13,661