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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
OPERATING ACTIVITIES    
NET INCOME $ 5,465 $ 197
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 64,439 62,772
Amortization of intangibles 3,130 1,218
Pension settlement expense 1,834 0
Share-based compensation expense 3,579 4,711
Provision for losses on accounts receivable 1,658 1,314
Deferred income tax benefit (5,770) (3,795)
Gain on sale of property and equipment (486) (582)
Changes in operating assets and liabilities:    
Receivables (36,513) (28,956)
Prepaid expenses 1,768 2,940
Other assets (1,557) (591)
Income taxes 6,868 938
Accounts payable, accrued expenses, and other liabilities 21,836 7,942
NET CASH PROVIDED BY OPERATING ACTIVITIES 66,251 48,108
INVESTING ACTIVITIES    
Purchases of property, plant and equipment, net of financings (13,078) (31,923)
Proceeds from sale of property and equipment 1,857 5,126
Purchases of short-term investments (21,230) (38,708)
Proceeds from sale of short-term investments 21,713 25,018
Business acquisitions, net of cash acquired (4,146) (180,793)
Capitalization of internally developed software and other (5,959) (5,379)
NET CASH USED IN INVESTING ACTIVITIES (20,843) (226,659)
FINANCING ACTIVITIES    
Borrowings under credit facilities 0 100,000
Payments on long-term debt (31,775) (22,606)
Net change in bank overdraft and other (2,002) (7,808)
Net change in restricted cash, cash equivalents, and short-term investments 7,757 42,895
Deferred financing costs (61) (1,472)
Payment of common stock dividends (2,418) (2,412)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES (28,499) 108,597
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 16,909 (69,954)
Cash and cash equivalents at beginning of period 90,702 141,295
CASH AND CASH EQUIVALENTS AT END OF PERIOD 107,611 71,341
NONCASH INVESTING ACTIVITIES    
Accruals for equipment received 264 34
Equipment financed $ 36 $ 37,973