Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets [Abstract]

Goodwill

The changes in the carrying amount of goodwill for the three months ended March 31, 2018 are as follows (in thousands):

Balance at December 31, 2017	$	305,238
Effect of foreign currency translation adjustments		(96)
Balance at March 31, 2018	$	305,142

Intangible Assets

The following table presents a summary of the Company's intangible assets that are subject to amortization (in thousands):

	March 31, 2018						December 31, 2017
	Gross Carrying Amounts		Accumulated Amortization		Net Carrying Amounts		Gross Carrying Amounts		Accumulated Amortization		Net Carrying Amounts
Customer relationships	$	71,976	$	(31,729)	$	40,247	$	75,407	$	(32,307)	$	43,100
Non-compete agreements		1,556		(788)		768		1,556		(707)		849
Customer backlog		1,650		(1,279)		371		1,650		(866)		784
Trade name		100		(77)		23		100		(53)		47
Internally developed software		11,235		(5,373)		5,862		11,325		(5,039)		6,286
Total	$	86,517	$	(39,246)	$	47,271	$	90,038	$	(38,972)	$	51,066

Estimated Useful Lives of Intangible Assets

The estimated useful lives of identifiable intangible assets are as follows:

Customer relationships	5 – 10 years
Non-compete agreements	2 – 5 years
Customer backlog	1  year
Trade name	1  year
Internally developed software	2 – 7 years

Estimated Annual Amortization Expense

Estimated annual amortization expense for the next five years ended December 31 and thereafter is as follows(in thousands):

2018 remaining	$	10,301
2019	$	12,322
2020	$	9,242
2021	$	7,109
2022	$	5,764
Thereafter	$	2,533