SEGMENT REPORTING (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of our segment performance measure to income before income taxes
Segment performance measure	$ 125,747	$ 109,365	$ 96,083
Corporate and unallocated expenses	(36,021)	(29,176)	(28,525)
Share-based compensation expense	(6,719)	(7,369)	(6,727)
Depreciation and software and leasehold amortization	(27,399)	(23,081)	(20,391)
Amortization of identifiable intangible assets	(26,588)	(21,323)	(9,190)
Fair value adjustment to contingent consideration	17,188	7,166
Acquisition related income (expense)	200	(7,681)	(2,125)
Intangible asset impairment expense	(1,777)	(1,278)
Other operating income	20		(656)
INCOME FROM OPERATIONS	44,651	26,623	28,469
Interest expense, net	(9,245)	(5,716)	(1,899)
INCOME BEFORE INCOME TAXES	$ 35,406	$ 20,907	$ 26,570

Represents amount of corporate and other expenses not allocated to reportable segments.

No definition available.

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, internally developed software, and leasehold assets to periods that benefit from use of the assets.

+ References

No definition available.

+ Details

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- Definition

The net of interest expense and investment income during the period.

+ References

No definition available.

+ Details

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- Definition

Aggregate amount of amortization expense recognized for intangible assets during the period that is not included elsewhere on the statement. A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible asset has a finite useful life, but the precise length of that life is not known, that intangible asset shall be amortized over the best estimate of its useful life.

+ References

No definition available.

+ Details

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- Definition

Represents the segment performance measure which is based on earnings before interest, taxes, depreciation and amortization, other operating expense, and share-based compensation expense.

+ References

No definition available.

+ Details

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- Definition

The amount of difference in fair value and carrying amount of contingent consideration payable charged to earnings during the reporting period.

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 23

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 59

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 3

-Subparagraph (b)

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 46

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- Definition

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Subparagraph 1(i)

-Article 4

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.6)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 5

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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