Goodwill and intangible assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill from January 1, 2012 to December 31, 2013, were as follows (in thousands):



	Drilling & Subsea				Production & Infrastructure					Total
	2013		2012		2013			2012		2013		2012
Goodwill Balance at January 1, net	$	616,520	$	523,019	$	79,279		$	77,808	$	695,799	$	600,827
Acquisition	100,257		85,092		—			—		100,257		85,092
Purchase accounting adjustment	97		—		—			1,379		97		1,379
Impact of non-U.S. local currency translation	6,481		8,409		(316		)	92		6,165		8,501
Goodwill Balance at December 31, net	$	723,355	$	616,520	$	78,963		$	79,279	$	802,318	$	695,799

Summary of Intangible Assets

At December 31, 2013 and 2012, intangible assets consisted of the following, respectively (in thousands):



	December 31, 2013
	Gross carrying amount		Accumulated amortization			Net amortizable intangibles		Amortization period (in years)
Customer relationships	$	283,171	$	(67,435	)	$	215,736	4-15
Patents and technology	33,843		(6,510		)	27,333		5-17
Non-compete agreements	6,577		(5,108		)	1,469		3-6
Trade names	46,654		(11,948		)	34,706		10-15
Distributor relationships	22,160		(11,282		)	10,878		8-15
Trademark	5,230		—			5,230		Indefinite
Intangible Assets Total	$	397,635	$	(102,283	)	$	295,352



	December 31, 2012
	Gross carrying amount		Accumulated amortization			Net amortizable intangibles		Amortization period (in years)
Customer relationships	$	241,358	$	(49,766	)	$	191,592	4-15
Patents and technology	19,780		(4,360		)	15,420		5-17
Non-compete agreements	5,880		(4,420		)	1,460		3-6
Trade names	40,255		(8,680		)	31,575		10-15
Distributor relationships	22,160		(10,018		)	12,142		8-15
Trademark	5,230		—			5,230		Indefinite
Intangible Assets Total	$	334,663	$	(77,244	)	$	257,419

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The total weighted average amortization period is 14 years and the estimated future amortization expense for the next five years is as follows (in thousands):



Year ending December 31,
2014	$	26,515
2015	26,455
2016	25,772
2017	25,426
2018	25,336