CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 31,818	$ 32,341
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	6,631	7,025
Amortization	14,418	13,040
Amortization of original issue discount	1,513	2,794
Asset impairment	2,147
(Gain) loss on short-term investments and other	(37)	3
Loss on repurchase of convertible notes		8,319
Gain on disposition of business operations		(6,611)
Deferred income taxes	1,725	78
Excess tax benefit of stock-based compensation awards		(3,440)
Stock-based compensation	11,644	12,086
Changes in operating assets and liabilities:
Trade accounts receivable, net	7,796	5,705
Other current and non-current assets	(4,787)	(1,866)
Income taxes payable/receivable	(1,402)	(7,971)
Trade accounts payable and accrued liabilities	(19,266)	(18,758)
Deferred revenue	12,288	8,020
Net cash provided by operating activities	64,488	50,765
Cash flows from investing activities:
Purchases of property and equipment	(18,738)	(8,863)
Purchases of short-term investments	(73,831)	(102,110)
Proceeds from sale/maturity of short-term investments	104,291	61,833
Acquisition of and investments in client contracts	(7,526)	(4,461)
Proceeds from the disposition of business operations		8,850
Net cash provided by (used in) investing activities	4,196	(44,751)
Cash flows from financing activities:
Proceeds from issuance of common stock	846	715
Payment of cash dividends	(13,713)	(12,265)
Repurchase of common stock	(16,482)	(19,494)
Proceeds from long-term debt		230,000
Payments on long-term debt	(7,500)	(3,750)
Repurchase of convertible notes		(198,367)
Settlement of convertible notes	(34,771)
Payments of deferred financing costs		(6,744)
Excess tax benefit of stock-based compensation awards		3,440
Net cash used in financing activities	(71,620)	(6,465)
Effect of exchange rate fluctuations on cash	1,696	2,937
Net increase (decrease) in cash and cash equivalents	(1,240)	2,486
Cash and cash equivalents, beginning of period	126,351	132,631
Cash and cash equivalents, end of period	125,111	135,117
Cash paid during the period for-
Interest	7,629	4,619
Income taxes	$ 10,490	$ 25,923

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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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

+ Details

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Period Type:	duration

- Definition

The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: 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=98514028&loc=d3e3213-108585

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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

Reference 1: 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=98514028&loc=d3e3255-108585

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Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: 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=98514028&loc=d3e3255-108585

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- Definition

The cash inflow from sales, maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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Period Type:	duration

- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ 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=98514028&loc=d3e3291-108585

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Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ 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=98514028&loc=d3e3291-108585

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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

+ Details

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