CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 57,980	$ 33,285	$ 32,773
Adjustments to reconcile net income to cash provided by operating activities:
Deferred income tax provision, net	989	12,243	2,007
Provision for bad debt	1,820	1,031	976
Depreciation and amortization	8,265	8,508	8,796
Stock-based compensation expense	8,797	7,600	6,705
Defined benefit pension plans expense	1,821	937	1,733
Loss on deferred compensation plan investments, net	563	510	597
Gain on sale of Global's assets	0	(3,148)	0
Other	388	1,453	279
(Increase) decrease in operating assets
Trade receivables, net	(10,851)	(20,535)	(8,403)
Income tax refund receivable	6,797	(6,944)	354
Prepaid expenses and other current assets	(2,050)	(1,471)	(1,631)
Other assets, net	994	(556)	(495)
Increase (decrease) in operating liabilities
Accounts payable and other accrued liabilities	3,932	(1,537)	(1,920)
Accrued payroll costs	1,350	1,954	(1,320)
Income taxes payable	4,858	(221)	(489)
Other long-term liabilities	2,070	(3,770)	(139)
Cash provided by operating activities	87,723	29,339	39,823
Cash flows from investing activities:
Capital expenditures	(5,170)	(5,846)	(12,420)
Proceeds from sale of Global's assets	1,000	1,000	0
Cash used in investing activities	(4,170)	(4,846)	(12,420)
Cash flows from financing activities:
Proceeds from credit facility	450,400	1,038,593	937,083
Payments on credit facility	(495,123)	(1,033,617)	(906,008)
Payments on other financing arrangements	(2,039)	(2,148)	(1,830)
Repurchases of common stock	(22,187)	(14,622)	(46,013)
Cash dividends	(14,871)	(12,144)	(12,447)
Payments of loan financing fees	0	(1,730)	(158)
Proceeds from exercise of stock options, net of shares tendered in payment of exercise	0	72	172
Proceeds from other financing arrangements	0	0	1,783
Cash used in financing activities	(83,820)	(25,596)	(27,418)
Change in cash and cash equivalents	(267)	(1,103)	(15)
Cash and cash equivalents at beginning of year	379	1,482	1,497
Cash and cash equivalents at end of year	$ 112	$ 379	$ 1,482