UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 26,916	$ 19,181	$ 21,188	$ 13,261	$ 46,097	$ 34,449
Adjustments to reconcile net income to cash provided by operating activities:
Deferred income tax provision, net					6,191	899
Provision for credit losses					(172)	(181)
Depreciation and amortization					2,169	2,394
Stock-based compensation expense					8,848	6,936
Defined benefit pension plan expense					0	2,157
Loss (Gain) on disposal or impairment of assets					170	(1,987)
Noncash lease expense					2,950	2,443
Loss on equity method investment					1,840	1,022
Other					361	445
Increase in operating assets
Trade receivables, net					(19,862)	(38,365)
Other assets					(3,637)	(4,890)
Increase in operating liabilities
Accrued payroll costs					17,566	17,002
Other liabilities					8,239	14,250
Cash provided by operating activities					70,760	36,574
Cash flows from investing activities:
Capital expenditures					(3,458)	(2,919)
Contributions to WorkLLama, joint venture					(500)	(4,500)
Note receivable issued to WorkLLama, joint venture					2,000	0
Net proceeds from the sale of assets					0	23,742
Cash (used in) provided by investing activities					(5,958)	16,323
Cash flows from financing activities:
Payments on credit facility					(100,000)	0
Repurchases of common stock					(19,600)	(29,371)
Cash dividends					(12,187)	(9,532)
Payments on other financing arrangements					(30)	(201)
Cash used in financing activities					(131,817)	(39,104)
Change in cash and cash equivalents					(67,015)	13,793
Cash and cash equivalents, beginning of period		96,989		103,486	96,989	103,486	$ 103,486
Cash and cash equivalents, end of period	29,974		117,279		29,974	117,279	$ 96,989
Cash Paid During the Period For:
Income taxes					7,437	10,500
Operating lease liabilities					3,622	3,564
Interest, net					892	1,280
Non-Cash Investing and Financing Transactions:
ROU assets obtained from operating leases					406	3,852
Employee stock purchase plan	$ 295	$ 242	$ 195	$ 170	537	365
Unsettled repurchases of common stock					$ 952	$ 0