Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash Flows from Operating Activities:
Net income (loss)	$ 4,888	$ (5,100)
Income from discontinued operations	0	(3,015)
Income (loss) from continuing operations	4,888	(8,115)
Adjustments to reconcile income (loss) from continuing operations to net cash flows from operating activities:
Depreciation and amortization	14,411	8,295
Deferred income taxes	(123)	(3,266)
Stock and deferred compensation plans	5,557	2,467
Pension expense, net of payments	3,000	3,195
Other changes in certain working capital accounts, net	(21,201)	(11,682)
Miscellaneous, net	(191)	842
Net cash provided by (used in) continuing operating activities	6,341	(8,264)
Net cash provided by discontinued operating activities	0	8,246
Net operating activities	6,341	(18)
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(6,321)	(2,305)
Purchase of investments	(1,553)	(6,450)
Change in restricted cash	1,100	0
Proceeds from sale of property, plant and equipment	4	5
Net cash used in continuing investing activities	(6,770)	(8,750)
Net cash used in discontinued investing activities	0	(1,561)
Net investing activities	(6,770)	(10,311)
Cash Flows from Financing Activities:
Payments on long-term debt	(1,000)	(500)
Repurchase of Class A Common shares	(10,131)	0
Proceeds from exercise of employee stock options	4,641	4,262
Tax payments related to shares withheld for RSU vesting	(2,579)	(4,872)
Miscellaneous, net	(2,311)	12,469
Net cash (used in) provided by continuing financing activities	(11,380)	11,359
(Decrease) increase in cash and cash equivalents	(11,809)	1,030
Cash and cash equivalents:
Beginning of year	108,061	158,459
End of period	96,252	159,489
Supplemental Cash Flow Disclosures
Interest paid	4,153	1,718
Income taxes paid	$ 493	$ 557