Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Before The Provision For Income Taxes

	2011		2010		2009
United States	$	144,928	$	92,979	$	83,561
Foreign		65,949		58,301		46,054
Total	$	210,877	$	151,280	$	129,615

Components Of Income Taxes

	2011			2010			2009
Current:
Federal	$	45,817		$	31,337		$	16,636
State		2,578			2,545			1,321
Foreign		17,375			13,496			13,355
Total current		65,770			47,378			31,312
Deferred:
Federal		1,538			(1,308	)		10,558
State		132			(93	)		900
Foreign		(3,898	)		(2,593	)		(2,207	)
Total deferred		(2,228	)		(3,994	)		9,251
Total provision	$	63,542		$	43,384		$	40,563

Summary Of The Provision For Income Taxes And The U.S. Federal Tax Rate

	2011					2010					2009
Computed "expected" tax expense	$	73,807		35.00	%	$	52,948		35.00	%	$	43,565		35.00	%
Changes resulting from:
Foreign income tax differential		(8,333	)	(3.95	)		(7,074	)	(4.68	)		(6,025	)	(4.65	)
State taxes net of federal benefits		1,923		0.91			1,279		0.85			1,490		1.15
Foreign-sourced non taxable income		(4,423	)	(2.10	)		(3,873	)	(2.56	)		(2,825	)	(2.18	)
Other		568		0.27			104		0.07			2,558		1.98
Provision for income taxes	$	63,542		30.13	%	$	43,384		28.68	%	$	40,563		31.30	%

Summary Of Deferred Tax Assets And Liabilities

	2011			2010
Deferred tax assets:
Accounts receivable, principally due to the allowance for doubtful accounts	$	3,251		$	3,201
Accrued expenses not currently deductible for tax		1,652			1,284
Stock based compensation		8,289			6,070
Foreign tax credit		177			177
Net operating loss carryforwards		3,168			2,865
Other		363			217
Deferred tax assets before valuation allowance		16,900			13,814
Valuation allowance		(1,709	)		(1,784	)
Deferred tax assets, net		15,191			12,030
Deferred tax liabilities:
Property and equipment, principally due to differences between book and tax depreciation		(4,020	)		(2,297	)
Intangibles—including goodwill		(119,254	)		(88,504	)
Deferred tax liabilities		(123,274	)		(90,801	)
Net deferred tax liabilities	$	(108,083	)	$	(78,771	)

Reconciliation Of Unrecognized Tax Benefits

Unrecognized tax benefits at January 1, 2009	$	3,601
Additions based on tax provisions related to the current year		859
Deductions based on settlement/expiration of prior year tax positions		(417	)
Unrecognized tax benefits at December 31, 2009		3,601
Additions based on tax provisions related to the current year		549
Deductions based on settlement/expiration of prior year tax positions		(680	)
Unrecognized tax benefits at December 31, 2010		3,912
Additions based on tax provisions related to the current year		524
Additions based on tax provisions related to the prior year		1,010
Deductions based on settlement/expiration of prior year tax positions		(452	)
Unrecognized tax benefits at December 31, 2011	$	4,994