Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill — All of the Company’s goodwill at both September 30, 2016 and December 31, 2015 related to the contract drilling operating segment. Goodwill as of September 30, 2016 and changes for the nine months then ended are as follows (in thousands):

	Nine Months Ended
	September 30, 2016
Balance at beginning of period	$	86,234
Changes to goodwill	—
Balance at end of period	$	86,234

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, 2016 and December 31, 2015 (in thousands):

	September 30, 2016							December 31, 2015
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Customer relationships	$	25,500	$	(21,857	)	$	3,643	$	25,500	$	(19,125	)	$	6,375