Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash Flows from Operating Activities
Net Income	$ 138,897,000	$ 89,600,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation, amortization and impairment of long-lived assets	54,040,000	50,044,000
Amortization of lease right-of-use asset	40,871,000	0
Net pension benefit and special separation benefit expense	(19,763,000)	(36,868,000)
(Gain) loss on marketable equity securities and cost method investments, net	(33,268,000)	16,656,000
Gain on disposition of businesses, property, plant and equipment and investments, net	(28,981,000)	(12,598,000)
Debt extinguishment costs	0	10,563,000
Stock-based compensation expense, net	3,227,000	3,262,000
Foreign exchange (gain) loss	(623,000)	2,089,000
Equity in earnings of affiliates, net of distributions	(396,000)	(2,945,000)
Provision (benefit) for deferred income taxes	13,481,000	(4,140,000)
Change in operating assets and liabilities:
Accounts receivable, net	27,181,000	79,007,000
Inventories	(21,878,000)	(14,109,000)
Accounts payable and accrued liabilities	(56,125,000)	(72,017,000)
Deferred revenue	(66,542,000)	(46,193,000)
Income taxes receivable	6,778,000	26,323,000
Other assets and other liabilities, net	(74,251,000)	(19,871,000)
Other	677,000	1,735,000
Net Cash (Used in) Provided by Operating Activities	(16,675,000)	70,538,000
Cash Flows from Investing Activities
Investments in certain businesses, net of cash acquired	(84,071,000)	(24,717,000)
Net proceeds (payments) from disposition of businesses, property, plant and equipment and investments	53,414,000	(13,332,000)
Purchases of property, plant and equipment	(52,703,000)	(40,506,000)
Investments in equity affiliates, cost method and other investments	(24,342,000)	(6,310,000)
Proceeds from sales of marketable equity securities	17,162,000	66,741,000
Purchases of marketable equity securities	(7,499,000)	0
Loan to related party and advance related to Kaplan University transaction	(3,500,000)	(28,061,000)
Return of investment in equity affiliates	638,000	2,056,000
Net Cash Used in Investing Activities	(100,901,000)	(44,129,000)
Cash Flows from Financing Activities
Common shares repurchased	0	(94,092,000)
Issuance of borrowings	30,000,000	400,000,000
Net proceeds from vehicle floor plan payable	24,618,000	0
Dividends paid	(14,779,000)	(14,453,000)
Contribution of noncontrolling interest	6,000,000	0
Repayments of borrowings and early redemption premium	(1,006,000)	(410,569,000)
Payments of debt financing costs	(33,000)	(6,924,000)
Other	(4,483,000)	(844,000)
Net Cash Provided by (Used in) Financing Activities	40,317,000	(126,882,000)
Effect Of Currency Exchange Rate Change	778,000	(4,352,000)
Net Decrease in Cash and Cash Equivalents and Restricted Cash	(76,481,000)	(104,825,000)
Beginning Cash and Cash Equivalents and Restricted Cash	264,115,000	407,566,000
Ending Cash and Cash Equivalents and Restricted Cash	$ 187,634,000	$ 302,741,000