Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net income	$ 4,836	$ 13,407
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	(513)	2,370
Noncash stock compensation expense	9,225	7,762
Noncash interest expense	1,711	5,762
Change in contingent consideration due to seller	(325)	543
Depreciation and amortization	29,251	28,855
Change in assets:
Accounts receivable	(145,536)	22,674
Income taxes receivable	3,635	3,015
Prepaid expenses and other assets	505	(386)
Change in liabilities:
Accounts payable	142,497	(5,243)
Accrued expenses and other liabilities	8,586	(9,363)
Payment of contingent consideration in excess of amounts established in purchase accounting	(507)	(1,097)
Net cash provided by operating activities	53,367	68,298
Investing activities
Purchases of property and equipment	(15,144)	(18,854)
Payments for acquisitions, net of cash acquired	0	(33)
Net cash used in investing activities	(15,144)	(18,887)
Financing activities
Payments of contingent consideration due to seller	(447)	(1,206)
Proceeds from exercise of stock options	405	37
Employee tax withholdings related to net share settlements of equity-based awards	(1,676)	(2,082)
Purchases of treasury stock	(10,349)	(26,108)
Purchases of Convertible Notes	(88,961)	(33,915)
Settlement of Convertible Notes	(69,242)	0
Proceeds from borrowing on ABL facility	170,000	25,000
Repayments of amounts borrowed on ABL facility	(25,000)	(25,000)
Net cash used in financing activities	(25,269)	(63,275)
Increase (Decrease) in cash and cash equivalents	12,953	(13,863)
Cash and cash equivalents, beginning of period	34,626	40,281
Cash and cash equivalents, end of period	47,579	26,418
Supplemental disclosure of cash flow information
Cash paid during the period for interest	3,967	3,172
Cash paid during the period for income taxes	303	4,238
Cash received during the period for income taxes refunded	$ 0	$ 3,348