Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net Income	$ 24,320	$ 6,990
Adjustments to reconcile net income to net cash provided by operating activities:
(Gain) loss on dispositions of assets	10	(4,170)
Depreciation	6,330	5,800
Amortization of intangible assets	4,910	4,990
Amortization of debt issue costs	470	350
Deferred income taxes	5,010	1,870
Non-cash compensation expense	1,220	1,470
Increase in receivables	(16,160)	(7,590)
Increase in inventories	(840)	(420)
Decrease in prepaid expenses and other assets	5,330	8,070
Decrease in accounts payable and accrued liabilities	(15,140)	(3,160)
Other operating activities	800	(570)
Net cash provided by operating activities	16,240	21,970
Cash Flows from Investing Activities:
Capital expenditures	(3,170)	(10,740)
Net proceeds from disposition of property and equipment	250	30
Net cash used for investing activities	(2,920)	(10,710)
Cash Flows from Financing Activities:
Repayments of borrowings on term loan facilities	0	(3,470)
Proceeds from borrowings on revolving credit and accounts receivable facilities	32,040	186,640
Repayments of borrowings on revolving credit and accounts receivable facilities	(33,970)	(191,760)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(2,300)	(450)
Other financing activities	0	(290)
Net cash used for financing activities	(4,230)	(9,330)
Net increase for the period	9,090	1,930
At beginning of period	27,580	20,710
At end of period	36,670	22,640
Supplemental disclosure of cash flow information:
Cash paid for interest	470	3,050
Cash paid for taxes	$ 970	$ 1,230