CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES
Net income	$ 4,128	$ 20,712
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,913	42,630
Amortization of intangibles	1,986	2,218
Pension settlement expense	1,464	1,716
Share-based compensation expense	4,200	4,233
Provision for losses on accounts receivable	418	627
Deferred income tax provision (benefit)	13,535	(2,559)
Gain on sale of property and equipment	(2,486)	(1,049)
Changes in operating assets and liabilities:
Receivables	(3,815)	(16,560)
Prepaid expenses	(806)	1,691
Other assets	(3,286)	385
Income taxes	(4,262)	12,306
Accounts payable, accrued expenses, and other liabilities	(7,539)	8,316
NET CASH PROVIDED BY OPERATING ACTIVITIES	52,450	74,666
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(26,082)	(34,205)
Proceeds from sale of property and equipment	6,250	2,690
Purchases of short-term investments	(18,685)	(10,780)
Proceeds from sale of short-term investments	16,415	2,967
Business acquisitions, net of cash acquired	197	(5,219)
Capitalization of internally developed software	(5,098)	(4,099)
NET CASH USED IN INVESTING ACTIVITIES	(27,003)	(48,646)
FINANCING ACTIVITIES
Borrowings under credit facilities		70,000
Borrowings under accounts receivable securitization program		35,000
Payments on long-term debt	(22,827)	(84,555)
Net change in book overdrafts	(6,489)	(1,522)
Net change in restricted cash	423	(1)
Deferred financing costs		(824)
Payment of common stock dividends	(4,175)	(3,162)
Purchase of treasury stock	(5,116)	(5,982)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(38,184)	8,954
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(12,737)	34,974
Cash and cash equivalents at beginning of period	164,973	157,042
CASH AND CASH EQUIVALENTS AT END OF PERIOD	152,236	192,016
NONCASH INVESTING ACTIVITIES
Accruals for equipment received	10,614	8,972
Equipment financed	$ 35,768	$ 12,670