Consolidated Statements of Cash Flows (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 23,904,000us-gaap_ProfitLoss	$ 40,004,000us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	41,813,000	37,641,000
Stock-based compensation	3,881,000us-gaap_ShareBasedCompensation	3,314,000us-gaap_ShareBasedCompensation
Excess tax benefit from share-based compensation	(834,000)	(3,580,000)
Deferred income taxes	10,236,000us-gaap_DeferredIncomeTaxExpenseBenefit	16,118,000us-gaap_DeferredIncomeTaxExpenseBenefit
Net gain on sale of assets	(317,000)	(838,000)
Loss on settlement of foreign currency forward purchase contracts	18,686,000	0
Changes in assets and liabilities which provided/(used) cash, net of effect of acquisitions:
Accounts receivable, net	20,547,000	(8,559,000)
Materials and supplies	543,000	131,000
Prepaid expenses and other	(3,410,000)	2,181,000
Accounts payable and accrued expenses	(32,133,000)	(15,582,000)
Other assets and liabilities, net	1,078,000	830,000
Net cash provided by operating activities	83,994,000	71,660,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(66,267,000)	(71,618,000)
Grant proceeds from outside parties	16,369,000gwr_GrantProceedsFromOutsideParties	12,800,000gwr_GrantProceedsFromOutsideParties
Cash paid for acquisitions, net of cash acquired	(723,944,000)	0
Net payment from settlement of foreign currency forward purchases contracts related to an acquisition	(18,686,000)	0
Insurance proceeds for the replacement of assets	1,421,000	300,000
Proceeds from disposition of property and equipment	1,082,000	1,555,000
Net cash used in investing activities	(790,025,000)	(56,963,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on long-term borrowings, including capital leases	(125,307,000)	(96,287,000)
Proceeds from issuance of long-term debt	892,805,000	46,546,000
Debt amendment/issuance costs	(5,933,000)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from employee stock purchases	2,727,000	4,647,000
Treasury stock purchases	(2,847,000)	(3,374,000)
Excess tax benefit from share-based compensation	834,000	3,580,000
Net cash provided by/(used in) financing activities	762,279,000	(44,888,000)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(3,555,000)	(498,000)
INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	52,693,000	(30,689,000)
CASH AND CASH EQUIVALENTS, beginning of period	59,727,000	62,876,000
CASH AND CASH EQUIVALENTS, end of period	$ 112,420,000	$ 32,187,000

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