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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 18,785 $ 17,905
Adjustments to reconcile net income to net cash used in operating activities:    
Loss from operations of discontinued operations, net of tax 4 239
Gain on disposal of discontinued operations, net of tax (22) (40)
Gain on sale of operations, net (2,589) (2,743)
Amortization of discount on convertible notes 636 1,041
Amortization of deferred financing costs 380 448
Bad debt expense, net of recoveries 739 1,323
Depreciation and amortization expense 5,228 5,030
Adjustment to contingent earnout liability (205) (1,109)
Deferred income taxes (1,647) 1,100
Employee stock awards 1,506 1,324
Excess tax benefits from share-based payment arrangements   (114)
Changes in assets and liabilities, net of acquisitions and divestitures:    
Restricted cash 2,122 2,076
Accounts receivable, net (43,383) (32,927)
Other assets (228) (649)
Accounts payable 543 (3,319)
Income taxes payable/refundable 14,162 11,686
Accrued personnel costs and other liabilities (7,334) (4,771)
Net cash used in continuing operations (11,303) (3,500)
Operating cash flows provided by (used in) discontinued operations 18 (250)
Net cash used in operating activities (11,285) (3,750)
Cash flows from investing activities:    
Business acquisitions and contingent consideration, net of cash acquired (19,025) (10,860)
Purchases of client fund investments (2,160) (4,931)
Proceeds from the sales and maturities of client fund investments 2,301 5,067
Proceeds from sales of divested and discontinued operations 1,037 486
Net decrease (increase) in funds held for clients 4,285 (29,765)
Additions to property and equipment, net (168) (531)
Other 10 (1)
Net cash used in investing activities (13,720) (40,535)
Cash flows from financing activities:    
Proceeds from bank debt 160,600 115,100
Payment of bank debt (127,200) (101,200)
Payment of contingent consideration for acquisitions (1,692) (330)
Payment for acquisition of treasury stock (601)  
Net (decrease) increase in client fund obligations (4,375) 29,598
Proceeds from exercise of stock options   628
Excess tax benefits from exercise of stock awards   114
Other (151) (118)
Net cash provided by financing activities 26,581 43,792
Net increase (decrease) in cash and cash equivalents 1,576 (493)
Cash and cash equivalents at beginning of year 1,613 724
Cash and cash equivalents at end of period $ 3,189 $ 231