Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities
Net income	$ 61,030	$ 48,154
Adjustment to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	34,828	38,122
Amortization of contract acquisition costs	1,448	4,806
Amortization of debt issuance costs and other	435	447
Accretion expense	649	60
Provision for doubtful accounts	301	642
Gain on disposal of assets	(351)	(482)
Impairment losses	230	1,006
Deferred income taxes	5,582	2,757
Excess tax benefit from equity-based awards	(756)	0
Equity-based compensation expense	11,563	9,976
Loss (gain) on foreign currency derivatives	966	(994)
Gain on Newgen legal settlement, net of tax	0	(3,542)
Changes in assets and liabilities, net of acquisition:
Accounts receivable	(26,332)	24,461
Prepaids and other assets	(13,459)	18,882
Accounts payable and accrued expenses	(28,302)	(11,129)
Deferred revenue and other liabilities	(8,330)	(13,210)
Net cash provided by operating activities	39,502	119,956
Cash flows from investing activities
Proceeds from sale of property, plant, and equipment	2,197	0
Purchases of property, plant and equipment	(21,166)	(17,391)
Payment of contract acquisition costs	(738)	0
Investment in deconsolidated subsidiary	0	(3,600)
Acquisitions, net of cash acquired of $14	(45,787)	0
Net cash used in investing activities	(65,494)	(20,991)
Cash flows from financing activities
Proceeds from line of credit	556,800	745,700
Payments on line of credit	(426,500)	(745,700)
Payments on capital lease obligations and equipment financing	(1,646)	(3,167)
Dividends distributed to noncontrolling interest	(2,783)	(3,015)
Proceeds from exercise of stock options	8,528	1,117
Excess tax benefit from equity-based awards	5,276	143
Purchase of treasury stock	(58,367)	(48,319)
Payments of debt issuance costs	(22)	0
Net cash provided by (used in) financing activities	81,286	(53,241)
Effect of exchange rate changes on cash and cash equivalents	(4,870)	4,003
Increase in cash and cash equivalents	50,424	49,727
Cash and cash equivalents, beginning of period	119,385	109,424
Cash and cash equivalents, end of period	169,809	159,151
Supplemental disclosures
Cash paid for interest	2,908	1,514
Cash paid for income taxes	16,710	11,916
Non-cash investing and financing activities
Acquisition of equipment through installment purchase agreements	$ 0	$ 186