UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 9,175	$ 5,902
Adjustments to reconcile net income to cash provided by (used in) operating activities:
Deferred income tax provision, net	41	1,758
Provision for bad debts	368	392
Depreciation and amortization	2,115	2,103
Stock-based compensation expense	2,260	2,064
Defined benefit pension plans expense	455	239
Loss on deferred compensation plan investments, net	110	104
Other	96	272
(Increase) decrease in operating assets
Trade receivables, net	(12,350)	(21,665)
Income tax refund receivable	6,341	(725)
Prepaid expenses and other current assets	91	(20)
Other assets, net	69	(127)
(Decrease) increase in operating liabilities
Accounts payable and other accrued liabilities	(2,096)	(2,113)
Accrued payroll costs	317	1,593
Income taxes payable	3,388	623
Other long-term liabilities	(130)	(913)
Cash provided by (used in) operating activities	10,250	(10,513)
Cash flows from investing activities:
Capital expenditures	(1,469)	(2,272)
Cash used in investing activities	(1,469)	(2,272)
Cash flows from financing activities:
Proceeds from credit facility	193,400	274,553
Payments on credit facility	(186,723)	(254,134)
Payments on other financing arrangements	(569)	(526)
Proceeds from exercise of stock options	0	72
Repurchases of common stock	(12,038)	(2,887)
Cash dividend	(2,973)	(3,037)
Cash (used in) provided by financing activities	(8,903)	14,041
Change in cash and cash equivalents	(122)	1,256
Cash and cash equivalents at beginning of period	379	1,482
Cash and cash equivalents at end of period	$ 257	$ 2,738