Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets [Abstract]

Goodwill

The changes in the carrying amount of goodwill for the six months ended June 30, 2016 are as follows (in thousands):

Balance at December 31, 2015	$	269,383
Purchase accounting adjustments		195
Effect of foreign currency translation adjustments		(42	)
Balance at June 30, 2016	$	269,536

Intangible Assets

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

	June 30, 2016							December 31, 2015
	Gross Carrying Amounts		Accumulated Amortization			Net Carrying Amounts		Gross Carrying Amounts		Accumulated Amortization			Net Carrying Amounts
Customer relationships	$	67,673	$	(27,620	)	$	40,053	$	68,959	$	(23,397	)	$	45,562
Non-compete agreements		858		(489	)		369		1,235		(719	)		516
Customer backlog		270		(188	)		82		350		(88	)		262
Trade name		100		(83	)		17		100		(33	)		67
Internally developed software		10,706		(3,262	)		7,444		9,500		(2,499	)		7,001
Total	$	79,607	$	(31,642	)	$	47,965	$	80,144	$	(26,736	)	$	53,408

Estimated Useful Lives of Intangible Assets

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

Customer relationships	3 – 10 years
Non-compete agreements	3 – 5 years
Internally developed software	1 – 7 years
Trade name	1  year
Customer backlog	9 – 12 months

Estimated Annual Amortization Expense

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

2016 remaining	$	6,398
2017	$	10,506
2018	$	9,548
2019	$	8,501
2020	$	5,479
Thereafter	$	7,533