Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows from Operating Activities
Net Income	$ 181,862,000	$ 214,670,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairment of long-lived assets	83,335,000	84,070,000
Amortization of lease right-of-use asset	61,797,000	0
Net pension benefit and special separation benefit expense	(33,061,000)	(55,458,000)
Gain on marketable equity securities and cost method investments, net	(54,341,000)	(36,793,000)
Gain on disposition of businesses, property, plant and equipment and investments, net	(28,871,000)	(13,379,000)
Provision for doubtful trade and other receivables	21,532,000	7,858,000
Debt extinguishment costs	0	10,563,000
Stock-based compensation expense, net	4,752,000	5,172,000
Foreign exchange (gain) loss	(1,284,000)	2,205,000
Write-down of cost method investments	0	2,500,000
Equity in earnings of affiliates, net of distributions	(3,882,000)	(10,294,000)
Provision (benefit) for deferred income taxes	26,310,000	(10,867,000)
Change in operating assets and liabilities:
Accounts receivable, net	(47,308,000)	47,342,000
Inventories	(11,969,000)	(10,913,000)
Accounts payable and accrued liabilities	(60,708,000)	(95,100,000)
Deferred revenue	24,920,000	38,148,000
Income taxes receivable	5,526,000	23,073,000
Other assets and other liabilities, net	(96,913,000)	(12,844,000)
Other	587,000	1,905,000
Net Cash Provided by Operating Activities	72,284,000	191,858,000
Cash Flows from Investing Activities
Investments in certain businesses, net of cash acquired	(162,060,000)	(111,451,000)
Purchases of property, plant and equipment	(75,712,000)	(58,850,000)
Net proceeds (payments) from disposition of businesses, property, plant and equipment and investments	53,785,000	(13,483,000)
Investments in equity affiliates, cost method and other investments	(25,836,000)	(10,679,000)
Proceeds from sales of marketable equity securities	17,586,000	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	786,000	4,521,000
Net Cash Used in Investing Activities	(202,450,000)	(151,262,000)
Cash Flows from Financing Activities
Common shares repurchased	0	(110,848,000)
Issuance of borrowings	30,000,000	400,000,000
Net borrowing under revolving credit facility	5,000,000	0
Net proceeds from vehicle floor plan payable	15,106,000	0
Dividends paid	(22,167,000)	(21,564,000)
Issuance of noncontrolling interest	6,536,000	0
Purchase of noncontrolling interest	(550,000)	(16,500,000)
Repayments of borrowings and early redemption premium	(7,901,000)	(417,112,000)
Payments of debt financing costs	(33,000)	(6,490,000)
Other	(356,000)	5,303,000
Net Cash Provided by (Used in) Financing Activities	25,635,000	(167,211,000)
Effect Of Currency Exchange Rate Change	(2,177,000)	(4,216,000)
Net Decrease in Cash and Cash Equivalents and Restricted Cash	(106,708,000)	(130,831,000)
Beginning Cash and Cash Equivalents and Restricted Cash	264,115,000	407,566,000
Ending Cash and Cash Equivalents and Restricted Cash	$ 157,407,000	$ 276,735,000