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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Cash Flows [Abstract]      
Net income (loss) $ (14,617) $ 67,235 $ (82,477)
Income (loss) from discontinued operations, net of tax (2,595) 7,313 (8,605)
Income (loss) from continuing operations, net of tax (12,022) 59,922 (73,872)
Adjustments to reconcile income (loss) from continuing operations to net cash flows from operating activities:      
Depreciation and amortization 56,343 55,204 49,791
Impairment of goodwill and intangibles 35,732 0 24,613
Gain on disposition of investments (6,106) 0 0
(Gains) losses on sale of property and equipment 169 480 305
Deferred income taxes (16,084) 38,794 (26,210)
Stock and deferred compensation plans 15,872 10,857 9,873
Pension expense, net of payments (6,738) 4,936 58,358
Other changes in certain working capital accounts, net (20,508) (34,861) (40,434)
Miscellaneous, net (16,473) 565 602
Net cash provided by continuing operating activities 30,185 135,897 3,026
Net cash provided by discontinued operating activities 10,667 10,596 5,844
Net operating activities 40,852 146,493 8,870
Cash Flows from Investing Activities:      
Acquisitions, net of cash acquired (280,940) (43,500) (46,838)
Proceeds from sale of property held for sale 0 0 14,500
Additions to property and equipment (17,932) (25,911) (20,788)
Acquisition of intangibles (9,745) 0 0
Purchase of investments (836) (2,128) (7,658)
Miscellaneous, net 12,886 147 3,300
Net cash used in continuing investing activities (296,567) (71,392) (57,484)
Net cash used in discontinued investing activities (2,500) (2,036) (3,878)
Net investing activities (299,067) (73,428) (61,362)
Cash Flows from Financing Activities:      
Proceeds from issuance of long-term debt 700,000 0 200,000
Payments on long-term debt (393,927) (6,635) (122,406)
Payments of financing costs (9,671) 0 (2,592)
Dividends paid 0 0 (59,523)
Repurchase of Class A Common shares (17,885) (44,401) (16,222)
Proceeds from employee stock options 1,461 4,641 7,249
Tax payments related to shares withheld for vested stock and RSUs (4,576) (2,681) (5,237)
Miscellaneous, net (2,840) (4,258) 575
Net cash provided by (used in) continuing financing activities 272,562 (53,334) 1,844
Increase (decrease) in cash, cash equivalents and restricted cash 14,347 19,731 (50,648)
Cash, cash equivalents and restricted cash:      
Beginning of year 134,352 114,621 165,269
End of year $ 148,699 $ 134,352 $ 114,621