Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Net income (loss)	$ 28,898	$ (60,945)
Loss from discontinued operations	0	15,432
Income (loss) from continuing operations	28,898	(45,513)
Adjustments to reconcile income (loss) from continuing operations to net cash flows from operating activities:
Depreciation and amortization	44,089	37,934
Impairment of goodwill and intangibles	0	24,613
Losses on sale of property and equipment	44	579
Deferred income taxes	16,517	(14,410)
Stock and deferred compensation plans	9,120	8,393
Pension expense, net of payments	2,046	10,065
Other changes in certain working capital accounts, net	(21,612)	(46,091)
Miscellaneous, net	1,886	2,788
Net cash provided by (used in) continuing operating activities	80,988	(21,642)
Net cash provided by discontinued operating activities	0	6,861
Net operating activities	80,988	(14,781)
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(43,500)	(46,838)
Additions to property and equipment	(21,590)	(15,244)
Purchase of investments	(1,728)	(7,087)
Change in restricted cash	1,100	250
Proceeds from sale of property and equipment	216	15
Net cash used in continuing investing activities	(65,502)	(68,904)
Net cash used in discontinued investing activities	0	(1,561)
Net investing activities	(65,502)	(70,465)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	0	200,000
Payments on long-term debt	(3,000)	(121,269)
Payments of financing costs	0	(2,592)
Payments of ordinary dividends, Common Stock	0	(59,523)
Repurchase of Class A Common shares	(29,673)	(10,901)
Proceeds from exercise of employee stock options	4,641	6,041
Tax payments related to shares withheld for RSU vesting	(2,652)	(5,126)
Miscellaneous, net	(4,485)	1,499
Net cash (used in) provided by continuing financing activities	(35,169)	8,129
Decrease in cash and cash equivalents	(19,683)	(77,117)
Cash and cash equivalents:
Beginning of year	108,061	158,459
End of period	88,378	81,342
Supplemental Cash Flow Disclosures
Interest paid	12,092	9,353
Income taxes paid	$ 393	$ 14,709