CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 32,341	$ 22,152
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation	7,025	7,545
Amortization	13,040	15,175
Amortization of original issue discount	2,794	3,063
Loss on short-term investments and other	3	122
Loss on repurchase of convertible notes	8,319
Gain on disposition of business operations	(6,611)
Deferred income taxes	78	(3,758)
Excess tax benefit of stock-based compensation awards	(3,440)	(1,809)
Stock-based compensation	12,086	10,473
Changes in operating assets and liabilities, net of acquired amounts:
Trade accounts receivable, net	5,705	5,398
Other current and non-current assets	(1,866)	(3,452)
Income taxes payable/receivable	(7,971)	(24)
Trade accounts payable and accrued liabilities	(18,758)	(5,635)
Deferred revenue	8,020	9,262
Net cash provided by operating activities	50,765	58,512
Cash flows from investing activities:
Purchases of property and equipment	(8,863)	(11,425)
Purchases of short-term investments	(102,110)	(73,917)
Proceeds from sale/maturity of short-term investments	61,833	94,794
Acquisition of and investments in client contracts	(4,461)	(4,526)
Proceeds from the disposition of business operations	8,850
Net cash provided by (used in) investing activities	(44,751)	4,926
Cash flows from financing activities:
Proceeds from issuance of common stock	715	740
Payment of cash dividends	(12,265)	(11,238)
Repurchase of common stock	(19,494)	(62,861)
Payments on acquired asset financing		(829)
Proceeds from long-term debt	230,000	150,000
Payments on long-term debt	(3,750)	(123,750)
Repurchase of convertible notes	(198,367)
Payments of deferred financing costs	(6,744)	(2,692)
Excess tax benefit of stock-based compensation awards	3,440	1,809
Net cash used in financing activities	(6,465)	(48,821)
Effect of exchange rate fluctuations on cash	2,937	(1,384)
Net increase in cash and cash equivalents	2,486	13,233
Cash and cash equivalents, beginning of period	132,631	81,712
Cash and cash equivalents, end of period	135,117	94,945
Cash paid during the period for-
Interest	4,619	4,343
Income taxes	$ 25,923	$ 20,761

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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
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 13
-Subparagraph (c)
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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
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The cash inflow from the additional capital contribution to the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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

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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.

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

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Cash outflows under financing arrangements with vendors (seller-financed debt), which had a maturity date at inception of more than one year (or more than one operating cycle, if longer); such debt may have arisen from purchases of property, plant and equipment or other productive assets.

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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.

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