CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net Income	$ 8,370	$ 4,128
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,332	48,913
Amortization of intangibles	2,271	1,986
Pension settlement expense	2,701	1,464
Share-based compensation expense	3,599	4,200
Provision for losses on accounts receivable	1,053	418
Deferred income tax provision (benefit)	2,687	13,535
(Gain) loss on sale of property and equipment	(412)	(2,486)
Changes in operating assets and liabilities:
Receivables	(21,091)	(2,292)
Prepaid expenses	(2,549)	(806)
Other assets	(3,100)	(3,286)
Income taxes	458	(4,262)
Accounts payable, accrued expenses, and other liabilities	9,007	(7,752)
NET CASH PROVIDED BY OPERATING ACTIVITIES	51,326	53,760
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(27,123)	(26,082)
Proceeds from sale of property and equipment	2,751	6,250
Purchases of short-term investments	(6,223)	(18,685)
Proceeds from sale of short-term investments	9,065	16,415
Business acquisitions, net of cash acquired		197
Capitalization of internally developed software	(4,323)	(5,098)
NET CASH USED IN INVESTING ACTIVITIES	(25,853)	(27,003)
FINANCING ACTIVITIES
Borrowings under accounts receivable securitization program	10,000
Payments on long-term debt	(34,948)	(22,827)
Net change in book overdrafts	(2,478)	(6,489)
Deferred financing costs	(275)
Payment of common stock dividends	(4,144)	(4,175)
Purchases of treasury stock	(3,611)	(5,116)
Payments for tax withheld on share-based compensation	(2,690)	(1,310)
NET CASH USED IN FINANCING ACTIVITIES	(38,146)	(39,917)
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	(12,673)	(13,160)
Cash and cash equivalents and restricted cash at beginning of period	115,242	166,357
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	102,569	153,197
NONCASH INVESTING ACTIVITIES
Equipment financed	38,593	35,768
Accruals for equipment received	$ 3,179	$ 10,614