CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
OPERATING ACTIVITIES
Net loss	$ (6,321)	$ (7,336)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	39,970	35,971
Amortization of intangibles	200
Share-based compensation expense	3,342	3,699
Provision for losses on accounts receivable	729	1,122
Deferred income tax benefit	(8,520)	(6,569)
Gain on sale of property and equipment	(516)	(873)
Changes in operating assets and liabilities:
Receivables	(20,885)	(25,756)
Prepaid expenses	1,363	836
Other assets	(452)	269
Income taxes	522	2,417
Accounts payable, accrued expenses and other liabilities	4,740	29,352
NET CASH PROVIDED BY OPERATING ACTIVITIES	14,172	33,132
INVESTING ACTIVITIES
Purchases of property, plant and equipment, net of financings	(18,401)	(18,766)
Proceeds from sales of property and equipment	2,692	3,370
Purchases of short-term investments	(22,143)	(12,250)
Proceeds from sales of short-term investments	9,555	14,125
Business acquisition, net of cash acquired	(180,793)
Capitalization of internally developed software and other	(3,435)	(2,183)
NET CASH USED IN INVESTING ACTIVITIES	(212,525)	(15,704)
FINANCING ACTIVITIES
Borrowings under credit facilities	100,000
Payments on long-term debt	(12,303)	(6,994)
Net change in bank overdraft and other	(5,510)	2,797
Change in restricted cash equivalents and short-term investments	31,668	(20)
Deferred financing costs	(1,574)	(133)
Payment of common stock dividends	(1,605)	(1,585)
Proceeds from the exercise of stock options		763
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	110,676	(5,172)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(87,677)	12,256
Cash and cash equivalents at beginning of period	141,295	102,578
CASH AND CASH EQUIVALENTS AT END OF PERIOD	53,618	114,834
NONCASH INVESTING ACTIVITIES
Accruals for equipment received	7,416	5,358
Equipment financed under capital leases and notes payable	$ 21,370	$ 3,882