Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Estimated Lives Used in Determining Depreciation

The estimated lives used in determining depreciation are as follows:

	Estimated Useful Life (Years)
Network equipment, computers and software	3-5
Buildings	30
Leasehold improvements	3-8
Office furniture and equipment	3-8
Motor vehicles	2-5

Summary of Lived Intangible Assets Amortized over their Estimated Useful Lives

The Company’s definite lived intangible assets are amortized over their estimated useful lives as listed below using a straight-line method:

Customer relationships	3-15 years
Leasehold benefits	3-8 years
Developed technology	5-10 years
Non-compete agreements	1-2 years
Trade names and trademarks	3-5 years

Computation of Basic and Diluted Earnings per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Year ended December 31,
	2015		2014		2013
Numerators:
Net income	$	51,565	$	32,445	$	48,097
Denominators:
Basic weighted average common shares outstanding	33,298,104		32,804,606		32,750,178
Dilutive effect of share based awards	880,236		831,987		1,092,760
Diluted weighted average common shares outstanding	34,178,340		33,636,593		33,842,938
Earnings per share:
Basic	$	1.55	$	0.99	$	1.47
Diluted	$	1.51	$	0.96	$	1.42
Weighted average common shares considered anti-dilutive in computing diluted earnings per share	73,896		114,395		268,219

Summary of Accumulated Other Comprehensive Loss

The balances as of December 31, 2015 and 2014 are as follows:

	December 31, 2015			December 31, 2014
Cumulative currency translation adjustments	$	(68,063	)	$	(55,553	)
Unrealized gain on cash flow hedges, net of taxes of $662 and $603	824			872
Retirement benefits, net of taxes of ($201) and ($277)	(86		)	(828		)
Accumulated other comprehensive loss	$	(67,325	)	$	(55,509	)

Summary of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities

Accrued expenses and other current liabilities consists of the following:

	December 31, 2015		December 31, 2014
Accrued expenses	$	26,238	$	24,451
Derivative instruments	1,226		2,385
Client liability account	2,217		9,241
Other current liabilities	4,569		4,129
Accrued expenses and other current liabilities	$	34,250	$	40,206

Summary of Non-current Liabilities

Non-current liabilities

Non-current liabilities consists of the following:

	December 31, 2015		December 31, 2014
Derivative instruments	$	1,132	$	576
Unrecognized tax benefits	3,066		2,878
Deferred rent	6,515		5,977
Retirement benefits	1,441		1,544
Other non-current liabilities	5,501		1,895
Non-current liabilities	$	17,655	$	12,870

Summary of Other Income, net

Other Income, net

Other Income, net consists of the following:

	Year ended December 31,
	2015			2014			2013
Interest and dividend income	$	6,806		$	3,709		$	3,169
Interest expense	(1,338		)	(369		)	(564		)
Other, net	221			263			(58		)
Other income, net	$	5,689		$	3,603		$	2,547