CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income		$ 130,862	$ 57,980	$ 33,285
Adjustments to reconcile net income to cash provided by operating activities:
Gain on sale of assets held for sale		(79,318)	0
Gain on sale of assets held for sale				(3,148)
Deferred income tax provision, net		(49)	989	12,243
Provision for bad debts		1,209	1,820	1,031
Depreciation and amortization		6,481	8,265	8,508
Stock-based compensation expense		9,912	8,797	7,600
Defined benefit pension plans expense		862	1,821	937
Loss on deferred compensation plan investments, net		245	563	510
Loss on disposal or impairment of assets		1,084	38	196
Noncash lease expense		6,282
Loss on equity method investment		831	0	0
Contingent consideration liability remeasurement		459	0	565
Other		352	350	692
(Increase) decrease in operating assets
Trade receivables, net		(5,360)	(10,851)	(20,535)
Other assets		(9,639)	5,741	(8,971)
Increase (decrease) in operating liabilities
Accrued payroll costs		4,567	1,350	1,954
Other liabilities		(2,163)	10,860	(5,528)
Cash provided by operating activities		66,617	87,723	29,339
Cash flows from investing activities:
Capital expenditures		(10,359)	(5,170)	(5,846)
Equity method investment		(9,000)	0	0
Net proceeds from the sale of assets held for sale		122,544	1,000	1,000
Cash provided by (used in) investing activities		103,185	(4,170)	(4,846)
Cash flows from financing activities:
Proceeds from credit facility		80,100	450,400	1,038,593
Payments on credit facility		(86,900)	(495,123)	(1,033,617)
Payments on other financing arrangements		(1,720)	(2,039)	(2,148)
Repurchases of common stock		(124,453)	(22,187)	(14,622)
Cash dividends		(16,608)	(14,871)	(12,144)
Payment of contingent consideration liability		(477)	0	0
Other		(25)	0	(1,658)
Cash used in financing activities		(150,083)	(83,820)	(25,596)
Change in cash and cash equivalents		19,719	(267)	(1,103)
Cash and cash equivalents at beginning of year		112	379	1,482
Cash and cash equivalents at end of year		19,831	112	379
Cash paid during the year for:
Income taxes	[1]	24,935	13,442	24,330
Operating lease liabilities		8,186
Interest, net		1,480	3,814	3,518
Non-Cash Financing and Investing Transactions:
ROU assets obtained from operating leases		9,205
Employee stock purchase plan		558	549	522
Unsettled repurchases of common stock		0	556	898
Receivable for sale of Kforce Global Solutions, Inc.'s assets		$ 0	0	$ 1,979
Proceeds from income tax refunds			$ 6,800

[1] During the year ended December 31, 2018, cash provided by operating activities included the receipt of an income tax refund in the amount of $6.8 million.