CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES
NET INCOME (LOSS)	$ (6,103)	$ 745
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	24,164	21,084
Amortization of intangibles	987	1,148
Pension settlement expense	900	1,119
Share-based compensation expense	1,709	1,647
Provision for losses on accounts receivable	82	312
Deferred income tax provision	5,212	1,507
Gain on sale of property and equipment	(311)	(310)
Changes in operating assets and liabilities:
Receivables	9,569	(902)
Prepaid expenses	(3,998)	(1,689)
Other assets	(2,954)	456
Income taxes	(10,211)	(2,426)
Accounts payable, accrued expenses, and other liabilities	(6,884)	(11,759)
NET CASH PROVIDED BY OPERATING ACTIVITIES	12,162	10,932
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(13,357)	(16,546)
Proceeds from sale of property and equipment	2,435	977
Purchases of short-term investments	(15,745)
Proceeds from sale of short-term investments	7,840
Business acquisitions, net of cash acquired		(5,170)
Capitalization of internally developed software	(2,668)	(2,087)
NET CASH USED IN INVESTING ACTIVITIES	(21,495)	(22,826)
FINANCING ACTIVITIES
Borrowings under credit facilities		70,000
Borrowings under accounts receivable securitization program		35,000
Payments on long-term debt	(11,066)	(77,254)
Net change in book overdrafts	(5,095)	(2,005)
Net change in restricted cash	(1)
Deferred financing costs		(824)
Payment of common stock dividends	(2,088)	(1,584)
Purchase of treasury stock	(2,602)	(2,459)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(20,852)	20,874
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(30,185)	8,980
Cash and cash equivalents at beginning of period	164,973	157,042
CASH AND CASH EQUIVALENTS AT END OF PERIOD	134,788	166,022
NONCASH INVESTING ACTIVITIES
Accruals for equipment received	8,486	$ 163
Equipment financed	$ 1,947