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	$ 271,408	$ 302,489	$ 169,458
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and goodwill and other long-lived asset impairment	112,245	113,310	92,894
Net pension benefit	(100,948)	(59,039)	(67,097)
Early retirement and special separation benefit program expense	0	1,825	0
Loss on marketable equity securities and cost method investments, net	4,180	0	0
Stock-based compensation expense, net	6,412	10,169	13,418
Debt extinguishment costs	10,563	0	0
Foreign exchange loss (gain)	3,844	(3,310)	39,890
Net (gain) loss on sales and disposition of businesses	(8,157)	569	(22,163)
Net (gain) loss on dispositions, sales or write-downs of marketable equity securities and cost method investments	(148)	200	30,449
Equity in (earnings) losses of affiliates, net of distributions	(10,606)	3,646	8,859
(Benefit from) provision for deferred income taxes	(7,123)	(146,452)	10,070
Net (gain) loss on sales or write-downs of property, plant and equipment	(1,642)	413	(32,362)
Change in operating assets and liabilities:
Accounts receivable, net	59,847	11,086	(47,892)
Inventories	(7,351)	(541)	(2,422)
Accounts payable and accrued liabilities	(44,892)	19,380	58,147
Deferred revenue	14,801	13,903	16,552
Income taxes receivable/payable	9,405	24,739	5,115
Other assets and other liabilities, net	(26,973)	(25,469)	(12,265)
Other	2,154	1,137	605
Net Cash Provided by Operating Activities	287,019	268,055	261,256
Cash Flows from Investing Activities
Investments in certain businesses, net of cash acquired	(111,546)	(299,938)	(245,084)
Purchases of property, plant and equipment	(98,192)	(60,358)	(66,612)
Proceeds from sales of marketable equity securities	66,741	0	29,702
Purchases of marketable equity securities	(42,659)	0	(48,265)
Advance related to Kaplan University transaction and loan to affiliate	(28,061)	(6,771)	(14,244)
Investments in equity affiliates, cost method and other investments	(11,702)	(82,944)	(6,273)
Net (payments) proceeds from sales of businesses, property, plant and equipment and other assets	(10,344)	3,265	39,490
Return of investment in equity affiliates	4,799	4,727	0
Net Cash Used in Investing Activities	(230,964)	(442,019)	(311,286)
Cash Flows from Financing Activities
Repayments of borrowings and early redemption premium	(417,159)	(7,715)	0
Issuance of borrowings	400,000	0	98,610
Common shares repurchased	(118,030)	(50,770)	(108,948)
Dividends paid	(28,617)	(28,329)	(27,325)
Purchase of noncontrolling interest and deferred payment of acquisition	(16,500)	(5,187)	(21,000)
Payments of financing costs	(6,501)	0	(648)
(Repayments of) proceeds from bank overdrafts	(5,717)	(9,505)	14,429
Other	165	1,400	1,805
Net Cash Used in Financing Activities	(192,359)	(100,106)	(43,077)
Effect of Currency Exchange Rate Change	(7,147)	10,820	(11,029)
Net Decrease in Cash and Cash Equivalents and Restricted Cash	(143,451)	(263,250)	(104,136)
Cash and Cash Equivalents and Restricted Cash at Beginning of Year	407,566	670,816	774,952
Cash and Cash Equivalents and Restricted Cash at End of Year	264,115	407,566	670,816
Cash paid during the year for:
Income taxes	54,000	4,000	65,000
Interest	$ 42,000	$ 33,000	$ 30,000