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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
OPERATING ACTIVITIES    
Net income (loss) $ 12,015 $ (8,517)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 39,540 43,914
Amortization of intangibles 2,137 2,087
Pension settlement expense 4,600  
Share-based compensation expense 3,668 2,485
Provision for losses on accounts receivable 1,032 1,312
Deferred income tax benefit (2,358) (5,761)
Gain on sale of property and equipment (249) (391)
Changes in operating assets and liabilities:    
Receivables (34,888) (26,617)
Prepaid expenses 1,383 1,402
Other assets (1,482) (297)
Income taxes 2,226 163
Accounts payable, accrued expenses, and other liabilities 30,019 18,152
NET CASH PROVIDED BY OPERATING ACTIVITIES 57,643 27,932
INVESTING ACTIVITIES    
Purchases of property, plant and equipment, net of financings (15,570) (8,638)
Proceeds from sale of property and equipment 1,241 1,430
Purchases of short-term investments (2,967) (6,692)
Proceeds from sale of short-term investments 2,940 5,914
Business acquisitions, net of cash acquired (2,663) (4,146)
Capitalization of internally developed software (3,859) (4,050)
NET CASH USED IN INVESTING ACTIVITIES (20,878) (16,182)
FINANCING ACTIVITIES    
Payments on long-term debt (16,528) (22,009)
Net change in bank overdraft 3,602 2,026
Net change in restricted cash, cash equivalents, and short-term investments 517 7,758
Deferred financing costs (61) (61)
Payment of common stock dividends (1,635) (1,613)
Proceeds from the exercise of stock options 1,136  
NET CASH USED IN FINANCING ACTIVITIES (12,969) (13,899)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 23,796 (2,149)
Cash and cash equivalents at beginning of period 105,354 90,702
CASH AND CASH EQUIVALENTS AT END OF PERIOD 129,150 88,553
NONCASH INVESTING ACTIVITIES    
Accruals for equipment received 6,869 268
Equipment financed $ 22,842