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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash Flows from Operating Activities:      
Net Income $ 30,548,000 $ 27,075,000 $ 9,526,000
Reconciliation of net income to net cash provided by operating activities:      
Depreciation and amortization 40,176,000 40,111,000 40,513,000
Goodwill impairment 0 17,674,000 17,484,000
Deferred income taxes (2,992,000) (9,005,000) 3,040,000
Gain on disposition of businesses, net 0 (13,763,000) 0
Stock-based compensation costs 7,585,000 4,384,000 4,109,000
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions:      
Accounts receivable, net (5,475,000) 5,063,000 5,922,000
Unbilled revenues, net (9,979,000) (3,762,000) 5,302,000
Accrued or prepaid income taxes (7,232,000) 9,311,000 (5,985,000)
Accounts payable and accrued liabilities 13,470,000 31,775,000 (6,946,000)
Deferred revenues 3,562,000 (1,074,000) (281,000)
Accrued retirement costs (15,478,000) (10,790,000) 3,387,000
Prepaid expenses and other operating activities 136,000 (3,821,000) (855,000)
Net cash provided by operating activities 54,321,000 93,178,000 75,216,000
Cash Flows from Investing Activities:      
Acquisitions of property and equipment (9,225,000) (14,226,000) (8,688,000)
Capitalization of computer software costs (21,729,000) (23,154,000) (12,436,000)
Cash proceeds from disposition of business line 0 19,968,000 0
Payments for business acquisitions, net of cash acquired (46,398,000) (9,983,000) (2,296,000)
Proceeds from settlement of life insurance policies 6,526,000 0 0
Other investing activities 0 358,000 0
Net cash used in investing activities (70,826,000) (27,037,000) (23,420,000)
Cash Flows from Financing Activities:      
Cash dividends paid (12,663,000) (9,645,000) (13,171,000)
Payments related to shares received for withholding taxes under stock-based compensation plans (1,411,000) (476,000) (827,000)
Proceeds from shares purchased under employee stock-based compensation plans 1,648,000 811,000 2,104,000
Repurchases of common stock (19,134,000) (2,666,000) (26,210,000)
Payments of contingent consideration on acquisitions (1,544,000) 0 0
Payments for equity investments (106,000) (602,000) 0
Increases in short-term and revolving credit facility borrowings 113,312,000 108,142,000 66,197,000
Payments on short-term and revolving credit facility borrowings (52,306,000) (169,675,000) (80,948,000)
Payments on finance lease obligations (432,000) (62,000) (93,000)
Capitalized loan costs (2,302,000) 0 0
Dividends paid to noncontrolling interests (405,000) (196,000) (458,000)
Net cash provided by (used in) financing activities 24,657,000 (74,369,000) (53,406,000)
Effects of exchange rate changes on cash and cash equivalents 881,000 1,082,000 293,000
Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash 9,033,000 (7,146,000) (1,317,000)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year 44,656,000 51,802,000 53,119,000
Cash, Cash Equivalents, and Restricted Cash at End of Year $ 53,689,000 $ 44,656,000 $ 51,802,000