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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 65,991 $ 39,390 $ 28,004
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 16,644 18,565 21,387
Impairment charges and other 0 10,480 3,687
Amortization of marketable securities 90 836 1,891
Stock-based compensation 16,643 13,345 11,053
Deferred income taxes 2,951 (14,733) (1,733)
Changes in operating assets and liabilities:      
Restricted cash (5,219) 6,622 7,888
Accounts receivable (69,619) (25,549) 34,893
Prepaid insurance (7,624) 13,884 (10,663)
Other current assets (2,391) 514 (5,596)
Other assets (8,941) (22,069) (32,013)
Accounts payable (1,192) 707 1,996
Payroll taxes and other payroll deductions payable 42,373 29,052 10,737
Accrued worksite employee payroll expense 53,297 (30,479) 18,595
Accrued health insurance costs 12,717 (4,686) 13,226
Accrued workers’ compensation costs 21,723 26,159 15,805
Accrued corporate payroll, commissions and other accrued liabilities 3,150 4,105 18,517
Income taxes payable/receivable (7,920) (1,060) 4,039
Total adjustments 66,682 25,693 113,709
Net cash provided by operating activities 132,673 65,083 141,713
Marketable securities:      
Purchases (1,049) (10,558) (69,578)
Proceeds from maturities 1,715 10,593 28,494
Proceeds from dispositions 7,268 17,869 56,880
Property and equipment:      
Purchases (33,994) (17,844) (19,124)
Proceeds from sale of aircraft 0 12,159 0
Proceeds from dispositions 43 153 122
Net cash provided by (used in) investing activities (26,017) 12,372 (3,206)
Cash flows from financing activities:      
Purchase of treasury stock (31,669) (67,113) (20,769)
Repurchase of common stock 144,263 0 0
Dividends paid (20,599) (21,153) (69,493)
Borrowings under long-term debt agreement 124,400 0 0
Principal repayments (20,000) 0 0
Proceeds from the exercise of stock options 598 374 279
Income tax benefit from stock-based compensation 0 2,216 889
Other 1,373 1,303 1,288
Net cash used in financing activities (90,160) (84,373) (87,806)
Net increase (decrease) in cash and cash equivalents 16,496 (6,918) 50,701
Cash and cash equivalents at beginning of year 269,538 276,456 225,755
Cash and cash equivalents at end of year 286,034 269,538 276,456
Supplemental disclosures of cash flow information:      
Income taxes, net 44,148 39,806 16,429
Interest expense $ 2,396 $ 459 $ 370