Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net income	$ 6,606	$ 16,376
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	29,373	29,197
Deferred income taxes	521	6,825
Stock and deferred compensation plans	11,227	8,861
Pension expense, net of contributions	202	5,099
Other changes in certain working capital accounts, net	(16,370)	(29,893)
Miscellaneous, net	(2,564)	896
Net cash provided by operating activities	28,995	37,361
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	0	(43,500)
Additions to property and equipment	(9,295)	(13,382)
Purchase of investments	(834)	(1,728)
Miscellaneous, net	3,634	22
Net cash used in investing activities	(6,495)	(58,588)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt	400,000	0
Payments on long-term debt	(389,542)	(2,000)
Payments of financing costs	(7,558)	0
Repurchase of Class A Common shares	(6,257)	(18,686)
Proceeds from exercise of stock options	1,461	4,641
Tax payments related to shares withheld for RSU vesting	(3,340)	(2,603)
Miscellaneous, net	(1,967)	(2,807)
Net cash used in financing activities	(7,203)	(21,455)
Increase (decrease) in cash, cash equivalents and restricted cash	15,297	(42,682)
Cash, cash equivalents and restricted cash:
Beginning of year	134,352	114,621
End of period	149,649	71,939
Supplemental Cash Flow Disclosures
Interest paid	4,855	8,143
Income taxes paid	$ 776	$ 355