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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash Flows from Operating Activities:    
Net (loss) income $ (1,939) $ 4,888
Adjustments to reconcile net (loss) income to net cash flows from operating activities:    
Depreciation and amortization 14,724 14,411
Deferred income taxes (5,177) (123)
Stock and deferred compensation plans 8,040 5,557
Pension expense, net of contributions 2,096 3,000
Other changes in certain working capital accounts, net (7,952) (21,201)
Miscellaneous, net (315) (191)
Net cash provided by operating activities 9,477 6,341
Cash Flows from Investing Activities:    
Additions to property and equipment (4,103) (6,321)
Purchase of investments (609) (1,553)
Miscellaneous, net 128 4
Net cash used in investing activities (4,584) (7,870)
Cash Flows from Financing Activities:    
Payments on long-term debt (979) (1,000)
Repurchase of Class A Common shares (1,760) (10,131)
Proceeds from exercise of stock options 1,461 4,641
Tax payments related to shares withheld for RSU vesting (3,287) (2,579)
Miscellaneous, net (2,412) (2,311)
Net cash used in financing activities (6,977) (11,380)
Decrease in cash, cash equivalents and restricted cash (2,084) (12,909)
Cash, cash equivalents and restricted cash:    
Beginning of year 134,352 114,621
End of period 132,268 101,712
Supplemental Cash Flow Disclosures    
Interest paid 3,507 4,153
Income taxes paid $ 66 $ 493