CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (5,414)	$ 20,582	$ (20,129)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	43,570	23,849	19,016
Debt issuance cost amortization	1,795	1,679	2,164
Gain on extinguishment of debt	0	(11)	(985)
Amortization of facility exit costs	0	0	(142)
Amortization of discount on long-term incentive plan and other accrued interest	427	425	512
Net loss on derivative	60,016	3,556	29,964
Net loss on revaluation of contingent consideration	932	0	0
Loss on impairment of long-lived assets	0	900	0
Net gain on sale of assets	(275)	(1,265)	(13)
Deferred income taxes	(12,579)	864	818
Deferred rent	0	0	510
Provision for doubtful accounts and customer disputes	4,198	1,533	1,103
Stock-based compensation	5,824	3,655	5,429
Changes in assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(37,766)	(13,466)	(8,982)
Inventories	(383)	(2,534)	(2,574)
Prepaid expenses and other current assets	(886)	217	2,497
Other assets and liabilities, net	(1,341)	(380)	(2,732)
Accounts payable and accrued liabilities	46,143	11,311	(2,276)
Net cash provided by operating activities	104,261	50,915	24,180
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(24,977)	(32,584)	(19,988)
Payments for acquisitions, net of cash acquired	(135,347)	(89,602)	(4,410)
Proceeds from disposals of property, plant and equipment	1,312	3,708	627
Proceeds from (payments for) disposals of business units	1,177	0	(2,333)
Net cash used in investing activities	(157,835)	(118,478)	(26,104)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolver borrowings	206,809	213	137,302
Repayments of revolver borrowings	(161,809)	(213)	(150,602)
Proceeds from debt issuance	0	0	200,000
Repayments of debt	(117)	0	(61,113)
Proceeds from exercise of stock options and warrants	546	396	224
Payments of other long-term obligations	(2,298)	(2,250)	0
Payments for other financing	(8,611)	(5,194)	(1,995)
Debt issuance costs	(893)	(974)	(9,063)
Payments for share repurchases	0	(4,824)	0
Other treasury share purchases	(6,330)	(2,056)	(4,913)
Net cash provided by (used in) financing activities	27,297	(14,902)	109,840
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(26,277)	(82,465)	107,916
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	30,202	112,667	4,751
CASH AND CASH EQUIVALENTS AT END OF PERIOD	3,925	30,202	112,667
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest	19,503	18,636	7,324
Cash paid for income taxes	1,949	1,464	305
Supplemental Disclosure of Non-cash Investing and Financing Activities:
Conversion of convertible debt to equity	0	0	6,381
Capital expenditures funded by capital leases and promissory notes	23,450	11,161	11,891
Acquisitions funded by stock issuance, contingent consideration and deferred payments	50,805	0	0
Dispositions funded through promissory note and deferred payments	$ 3,380	$ 0	$ 0