CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 67,560us-gaap_NetIncomeLoss	$ 63,868us-gaap_NetIncomeLoss	$ 48,846us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation	20,506us-gaap_Depreciation	18,751us-gaap_Depreciation	13,284us-gaap_Depreciation
Amortization	66,177us-gaap_AdjustmentForAmortization	51,216us-gaap_AdjustmentForAmortization	37,497us-gaap_AdjustmentForAmortization
Amortization of deferred debt issuance costs	5,877us-gaap_AmortizationOfFinancingCosts	5,388us-gaap_AmortizationOfFinancingCosts	2,450us-gaap_AmortizationOfFinancingCosts
Deferred income taxes	8,437us-gaap_DeferredIncomeTaxExpenseBenefit	9,573us-gaap_DeferredIncomeTaxExpenseBenefit	4,775us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense	11,045us-gaap_ShareBasedCompensation	13,572us-gaap_ShareBasedCompensation	15,186us-gaap_ShareBasedCompensation
Excess tax benefit of stock options exercised	(11,807)	(6,960)	(3,543)
Other	1,852us-gaap_OtherNoncashIncomeExpense	(593)us-gaap_OtherNoncashIncomeExpense	150us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of impact of acquisitions:
Receivables	(30,643)	22,496	(61,965)
Accounts payable	(3,422)	(13,548)	5,981
Accrued employee compensation	(6,360)	(24,501)	(29,026)
Repayment of IBM Alliance agreement liability			(20,667)
Current income taxes	10,968	9,360	(5,660)
Deferred revenue	15,738	(23,613)	(11,816)
Other current and noncurrent assets and liabilities	(6,902)	13,409	(4,757)
Net cash flows from operating activities	149,026	138,418	(9,265)
Cash flows from investing activities:
Purchases of property and equipment	(17,627)	(21,104)	(13,050)
Purchases of software and distribution rights	(17,273)us-gaap_PaymentsToAcquireSoftware	(11,497)us-gaap_PaymentsToAcquireSoftware	(3,612)us-gaap_PaymentsToAcquireSoftware
Acquisition of businesses, net of cash acquired	(204,290)	(378,113)	(325,232)
Other	(1,500)		(1,046)
Net cash flows from investing activities	(240,690)	(410,714)	(342,940)
Cash flows from financing activities:
Proceeds from issuance of common stock	2,780	2,186	1,426
Proceeds from exercises of stock options	16,461	19,561	16,730
Excess tax benefit of stock options exercised	11,807	6,960	3,543
Repurchases of common stock	(70,000)	(80,912)	(57,836)
Repurchase of restricted stock and performance shares for tax withholdings	(5,120)	(6,222)	(3,273)
Proceeds from exercises of common stock warrants			11,866us-gaap_ProceedsFromWarrantExercises
Cash settlement of common stock warrants			(29,596)us-gaap_PaymentsForRepurchaseOfWarrants
Proceeds from revolving credit facility	169,500us-gaap_ProceedsFromLinesOfCredit	40,000us-gaap_ProceedsFromLinesOfCredit	119,000us-gaap_ProceedsFromLinesOfCredit
Proceeds from term portion of credit agreement	150,000	300,000	200,000
Proceeds from issuance of senior notes		300,000
Repayments of revolving credit facility	(125,500)us-gaap_RepaymentsOfLinesOfCredit	(228,000)us-gaap_RepaymentsOfLinesOfCredit	(6,000)us-gaap_RepaymentsOfLinesOfCredit
Repayment of term portion of credit agreement	(57,449)us-gaap_RepaymentsOfSecuredDebt	(30,867)us-gaap_RepaymentsOfSecuredDebt	(13,750)us-gaap_RepaymentsOfSecuredDebt
Payments on other debt and capital leases	(8,344)	(14,024)	(7,115)
Payment for debt issuance costs	(4,662)us-gaap_PaymentsOfDebtIssuanceCosts	(17,042)us-gaap_PaymentsOfDebtIssuanceCosts	(1,094)us-gaap_PaymentsOfDebtIssuanceCosts
Distribution to noncontrolling interest	(1,391)us-gaap_PaymentsToMinorityShareholders
Net cash flows from financing activities	78,082	291,640	233,901
Effect of exchange rate fluctuations on cash	(4,176)	(614)	(2,465)
Net increase (decrease) in cash and cash equivalents	(17,758)	18,730	(120,769)
Cash and cash equivalents, beginning of period	95,059	76,329	197,098
Cash and cash equivalents, end of period	77,301	95,059	76,329
Supplemental cash flow information
Income taxes paid, net	23,082us-gaap_IncomeTaxesPaidNet	20,191us-gaap_IncomeTaxesPaidNet	28,900us-gaap_IncomeTaxesPaidNet
Interest paid	$ 33,269us-gaap_InterestPaid	$ 14,598us-gaap_InterestPaid	$ 8,275us-gaap_InterestPaid

The Company's payment of the refundable portion of Alliance proceeds to IBM.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition from vendors of software programs or applications for internal use (that is, not to be sold, leased or otherwise marketed to others) that qualify for capitalization.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

+ Details

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ 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.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

No definition available.

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ 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.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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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

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