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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 75,418 $ 76,741
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 100,254 90,265
Stock-based compensation 9,525 6,961
Excess tax benefit from share-based compensation 0 (1,254)
Deferred income taxes 16,336 22,672
Net loss/(gain) on sale and impairment of assets 12,517 (807)
Loss on settlement of foreign currency forward purchase contracts 0 18,686
Changes in assets and liabilities which provided/(used) cash, net of effect of acquisitions:    
Accounts receivable, net (11,472) 35,744
Materials and supplies (1,071) (868)
Prepaid expenses and other (2,078) 5,685
Accounts payable and accrued expenses (46,236) (73,397)
Other assets and liabilities, net 8,808 4,255
Net cash provided by operating activities 162,001 184,683
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (113,321) (160,226)
Grant proceeds from outside parties 25,990 22,701
Cash paid for acquisitions, net of cash acquired 0 (726,698)
Net payment from settlement of foreign currency forward purchase contracts related to an acquisition 0 (18,686)
Insurance proceeds for the replacement of assets 7,741 1,421
Proceeds from disposition of property and equipment 1,458 1,734
Net cash used in investing activities (78,132) (879,754)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on revolving line-of-credit, long-term debt and capital lease obligations (311,930) (306,799)
Proceeds from revolving line-of-credit and long-term borrowings 215,434 977,867
Debt amendment/issuance costs 0 (5,933)
Proceeds from employee stock purchases 3,135 4,183
Treasury stock purchases (2,593) (2,992)
Excess tax benefit from share-based compensation 0 1,254
Net cash (used in)/provided by financing activities (95,954) 667,580
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS 1,115 (1,899)
DECREASE IN CASH AND CASH EQUIVALENTS (10,970) (29,390)
CASH AND CASH EQUIVALENTS, beginning of period 35,941 59,727
CASH AND CASH EQUIVALENTS, end of period $ 24,971 $ 30,337