Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ 43,920	$ 21,840
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on dispositions of assets	(70)	(3,030)
Depreciation	12,870	13,050
Amortization of intangible assets	9,740	9,990
Amortization of debt issue costs	740	690
Deferred income taxes	6,340	2,060
Non-cash compensation expense	2,620	3,340
Increase in receivables	(20,380)	(11,490)
(Increase) decrease in inventories	(5,880)	2,850
Decrease in prepaid expenses and other assets	8,970	6,280
Decrease in accounts payable and accrued liabilities	(7,530)	(1,930)
Other operating activities	140	(120)
Net cash provided by operating activities	51,620	49,590
Cash Flows from Investing Activities:
Capital expenditures	(11,320)	(16,910)
Net proceeds from disposition of property and equipment	250	1,780
Net cash used for investing activities	(11,070)	(15,130)
Cash Flows from Financing Activities:
Repayments of borrowings on term loan facilities	0	(6,910)
Proceeds from borrowings on revolving credit and accounts receivable facilities	59,060	300,050
Repayments of borrowings on revolving credit and accounts receivable facilities	(68,490)	(324,900)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(2,380)	(480)
Payments to purchase common stock	(2,920)	0
Other financing activities	0	(250)
Net cash used for financing activities	(14,730)	(32,490)
Net increase for the period	25,820	1,970
At beginning of period	27,580	20,710
At end of period	53,400	22,680
Supplemental disclosure of cash flow information:
Cash paid for interest	7,630	6,060
Cash paid for taxes	$ 3,210	$ 10,600