UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (20,871)	$ (7,089)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	68,902	68,356
Allowance for doubtful accounts	1,072	2,204
Amortization of deferred financing costs and debt discount	872	819
Accretion of environmental liabilities	2,505	2,619
Changes in environmental liability estimates	(95)	385
Deferred income taxes	7	(903)
Stock-based compensation	2,093	1,850
Excess tax benefit of stock-based compensation	0	(5)
Net tax (deficiency) benefit on stock based awards	(345)	(111)
Other expense (income)	350	(409)
Environmental expenditures	(3,518)	(5,604)
Changes in assets and liabilities, net of acquisitions
Accounts receivable and unbilled accounts receivable	35,839	27,065
Inventories and supplies	(2,882)	22,131
Other current assets	1,838	374
Accounts payable	(36,195)	2,623
Other current and long-term liabilities	(10,283)	(29,528)
Net cash from operating activities	39,289	84,777
Cash flows from investing activities:
Additions to property, plant and equipment	(75,781)	(52,949)
Proceeds from sales of fixed assets	1,273	760
Acquisitions, net of cash acquired	(34,993)	0
Additions to intangible assets, including costs to obtain or renew permits	(512)	(1,171)
Net cash used in investing activities	(110,013)	(53,360)
Cash flows from financing activities:
Change in uncashed checks	(5,218)	(20,268)
Issuance of restricted shares, net of shares remitted	(1,425)	(1,154)
Repurchases of common stock	(4,998)	(15,379)
Deferred financing costs paid	(2,190)	0
Payments on capital leases	0	(398)
Excess tax benefit of stock-based compensation	0	5
Issuance of senior secured notes, including premium	250,625	0
Net cash from financing activities	236,794	(37,194)
Effect of exchange rate change on cash	4,567	(7,363)
Increase (decrease) in cash and cash equivalents	170,637	(13,140)
Cash and cash equivalents, beginning of period	184,708	246,879
Cash and cash equivalents, end of period	355,345	233,739
Cash payments for interest and income taxes:
Interest paid	21,808	21,667
Income taxes paid (received)	5,848	(3,790)
Non-cash investing and financing activities:
Accrual for repurchased shares	0	736
Property, plant and equipment accrued	14,947	22,832
Receivable for estimated purchase price adjustment	$ 250	$ 0