Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows from Operating Activities:
Net Income	$ 66,590	$ 34,970
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on dispositions of assets	(70)	(3,210)
Depreciation	18,630	18,890
Amortization of intangible assets	14,600	14,920
Amortization of debt issue costs	1,020	1,030
Deferred income taxes	9,290	2,420
Non-cash compensation expense	4,400	5,090
Debt financing and related expenses	0	6,640
Increase in receivables	(20,060)	(12,700)
Increase in inventories	(10,750)	(580)
Decrease in prepaid expenses and other assets	7,180	7,110
Decrease in accounts payable and accrued liabilities	(6,740)	(8,590)
Other operating activities	(1,140)	240
Net cash provided by operating activities	83,090	72,650
Cash Flows from Investing Activities:
Capital expenditures	(15,890)	(24,120)
Net proceeds from disposition of property and equipment	250	1,800
Net cash used for investing activities	(15,640)	(22,320)
Cash Flows from Financing Activities:
Proceeds from issuance of senior notes	0	300,000
Repayments of borrowings on term loan facilities	0	(257,940)
Proceeds from borrowings on revolving credit and accounts receivable facilities	59,060	353,710
Repayments of borrowings on revolving credit and accounts receivable facilities	(68,490)	(435,250)
Debt financing fees	0	(6,070)
Shares surrendered upon exercise and vesting of equity awards to cover taxes	(2,380)	(480)
Payments to purchase common stock	(3,590)	0
Other financing activities	0	(250)
Net cash used for financing activities	(15,400)	(46,280)
Net increase for the period	52,050	4,050
At beginning of period	27,580	20,710
At end of period	79,630	24,760
Supplemental disclosure of cash flow information:
Cash paid for interest	7,840	9,020
Cash paid for taxes	$ 5,020	$ 13,140