Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows from Operating Activities:
Net income (loss)	$ 39,922	$ (15,687)	$ 130,406
Income from discontinued operations	0	0	(101,536)
Income (loss) from continuing operations, net of tax	39,922	(15,687)	28,870
Adjustments to reconcile income (loss) from continuing operations to net cash flows from operating activities:
Depreciation and amortization	49,332	40,069	44,894
Contract termination fees	5,663	0	0
Impairment of long-lived assets	0	9,000	0
Losses/(gains) on sale of property, plant and equipment	474	(124)	1,218
Gain on sale of investments	0	0	(2,275)
Deferred income taxes	8,297	9,786	25,822
Excess tax benefits of share-based compensation plans	(4,206)	(5,814)	(9,559)
Stock and deferred compensation plans	8,223	7,197	8,892
Pension expense, net of payments	5,903	4,840	(62,774)
Other changes in certain working capital accounts, net	60,594	(41,779)	32,388
Miscellaneous, net	(1,620)	7,299	(8,196)
Net cash provided by continuing operating activities	172,582	14,787	59,280
Net cash provided by discontinued operating activities	0	0	6,691
Net operating activities	172,582	14,787	65,971
Cash Flows from Investing Activities:
Acquisitions	(266)	(216,143)	0
Additions to property, plant and equipment	(30,210)	(12,183)	(18,241)
Changes in restricted cash	0	(7,510)	0
Purchase of investments	(5,066)	(9,045)	(1,673)
Miscellaneous, net	3,118	4,388	12,096
Net cash used in continuing investing activities	(32,424)	(240,493)	(7,818)
Net cash provided by discontinued investing activities	0	0	162,895
Net investing activities	(32,424)	(240,493)	155,077
Cash Flows from Financing Activities:
Increases in long-term debt	0	212,000	0
Payments on long-term debt	(15,900)	0	(34,900)
Payments of financing costs	(993)	(8,871)	(330)
Repurchase of Class A Common shares	(23,564)	(51,383)	0
Proceeds from employee stock options	18,215	2,514	8,394
Tax payments related to shares withheld for vested stock and RSUs	(7,658)	(9,596)	(12,071)
Excess tax benefits from stock compensation plans	4,206	5,814	9,559
Miscellaneous, net	289	(1,807)	314
Net cash (used in) provided by continuing financing activities	(25,405)	148,671	(29,034)
Change in cash — discontinued operations	0	0	5,229
Increase (decrease) in cash and cash equivalents	114,753	(77,035)	197,243
Cash and cash equivalents:
Beginning of year	127,889	204,924	7,681
End of year	$ 242,642	$ 127,889	$ 204,924