Condensed Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income (loss)	$ 40,627	$ (2,881)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	42,904	39,008
Non-cash interest expense, net	870	736
Non-cash stock-based compensation expense	3,773	3,523
Provision for (benefit from) deferred income taxes	8,403	(4,369)
Equity in earnings of unconsolidated affiliates	(1,646)	(3,066)
Gains on sales of assets, net, including estimated losses on fixed assets held-for-sale	(57)	(1,025)
Other non-cash items, net	288	633
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	73,723	(54,992)
Inventories	21,404	(9,090)
Other assets, current and long-term portion	2,190	28,843
Accounts payable and accrued expenses	(74,121)	23,245
Billings in excess of costs and earnings	19,612	28,038
Book overdrafts	(2,187)	(3,712)
Other liabilities, current and long-term portion	18,390	(29,040)
Net cash provided by operating activities	154,173	15,851
Cash flows from investing activities:
Capital expenditures	(28,901)	(13,343)
Proceeds from sale of property and equipment	511	2,237
Payments for other investments	(53,347)	(1,514)
Proceeds from other investments	12,118	0
Net cash used in investing activities	(69,619)	(12,620)
Cash flows from financing activities:
Proceeds from credit facilities	361,743	335,747
Repayments of credit facilities	(447,112)	(320,742)
Repayments of other borrowings	(1,499)	(6,543)
Payments of capital lease obligations	(12,912)	(14,175)
Payments of financing costs	(5,973)	0
Distributions to non-controlling interests	(1,280)	0
(Payments for) proceeds from stock-based awards, net	(761)	1,817
Other financing activities, net	0	248
Net cash used in financing activities	(107,794)	(3,648)
Effect of currency translation on cash	160	(682)
Net decrease in cash and cash equivalents	(23,080)	(1,099)
Cash and cash equivalents - beginning of period	38,767	4,984
Cash and cash equivalents - end of period	15,687	3,885
Supplemental cash flow information:
Interest paid	18,023	15,828
Income taxes paid, net of refunds	1,772	2,295
Supplemental disclosure of non-cash information:
Equipment acquired under capital lease	33,916	0
Accrued capital expenditures	$ 1,029	$ 6,806