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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 32,032 $ 40,402 $ 30,470
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 21,033 18,183 15,218
Loss on exchange of assets 0 0 4,408
Impairment charges 6,021 4,191 0
Amortization of marketable securities 2,119 2,295 2,172
Stock-based compensation 11,103 9,814 8,601
Deferred income taxes (2,288) (5,743) (46)
Changes in operating assets and liabilities, net of acquisitions:      
Restricted cash (4,779) (2,412) (3,533)
Accounts receivable (19,623) (19,453) (28,826)
Prepaid insurance 4,982 5,680 3,678
Other current assets (2,402) 1,837 (2,862)
Other assets (18,060) (12,924) (652)
Accounts payable (982) (1,425) 1,776
Payroll taxes and other payroll deductions payable (12,930) 9,922 23,556
Accrued worksite employee payroll expense 23,731 19,753 20,620
Accrued health insurance costs (8,839) 4,515 (5,992)
Accrued workers’ compensation costs 7,815 7,418 8,791
Accrued corporate payroll, commissions and other accrued liabilities 556 2,353 (1,871)
Income taxes payable/receivable (4,825) 6,392 (1,597)
Total adjustments 2,632 50,396 43,441
Net cash provided by operating activities 34,664 90,798 73,911
Marketable securities:      
Purchases (54,756) (30,680) (51,397)
Proceeds from maturities 15,201 32,619 31,706
Proceeds from dispositions 8,026 35,891 3,907
Investments and acquisitions, net of cash acquired 0 (2,410) (14,555)
Property and equipment:      
Purchases (11,562) (17,631) (31,440)
Proceeds from dispositions 57 69 82
Net cash provided by (used in) investing activities (43,034) 17,858 (61,697)
Cash flows from financing activities:      
Purchase of treasury stock (17,229) (13,773) (25,079)
Repurchase of common stock 0 (3,162) 0
Dividends paid (17,386) (42,728) (15,742)
Proceeds from the exercise of stock options 1,448 2,249 3,956
Income tax benefit from stock-based compensation 1,621 2,316 2,166
Other 1,127 (222) (1,136)
Net cash used in financing activities (30,419) (55,320) (35,835)
Net increase (decrease) in cash and cash equivalents (38,789) 53,336 (23,621)
Cash and cash equivalents at beginning of year 264,544 211,208 234,829
Cash and cash equivalents at end of year 225,755 264,544 211,208
Supplemental disclosures:      
Cash paid for income taxes $ 27,191 $ 24,924 $ 19,782