Unaudited Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities
Net income	$ 43,625	$ 76,554
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,656	25,893
Provision for uncollectible accounts receivable	12,953	12,132
Stock option expense	7,738	6,259
Benefit for deferred income taxes	(36,175)	(5,530)
Potential litigation settlement	90,000
Noncash early retirement expense		1,747
Amortization of restricted stock awards	933	1,415
Noncash directors' compensation	766	541
Noncash long-term incentive compensation	2,888	837
Amortization of debt issuance costs	387	390
Changes in operating assets and liabilities:
Decrease in accounts receivable	27,534	8,061
Decrease in inventories	97	213
Increase in prepaid expenses	(2,573)	(1,646)
Increase/(decrease) in accounts payable and other current liabilities	2,448	(5,471)
Increase in income taxes	12,432	8,587
Increase in other assets	(6,238)	(5,694)
Increase in other liabilities	6,046	6,835
Excess tax benefit on share-based compensation		(2,974)
Other sources	1,472	204
Net cash provided by operating activities	190,989	128,353
Cash Flows from Investing Activities
Capital expenditures	(50,247)	(29,708)
Business combinations	(525)
Other sources/(uses)	116	(114)
Net cash used by investing activities	(50,656)	(29,822)
Cash Flows from Financing Activities
Payments on revolving line of credit	(203,700)	(85,200)
Proceeds from revolving line of credit	183,700	110,200
Purchases of treasury stock	(94,640)	(102,313)
Dividends paid	(12,879)	(12,215)
Proceeds from exercise of stock options	11,625	4,625
Change in cash overdrafts payable	(8,139)	2,092
Capital stock surrendered to pay taxes on stock-based compensation	(7,637)	(7,051)
Payments on other long-term debt	(6,250)	(5,625)
Excess tax benefit on share-based compensation		2,974
Other sources	1,148	540
Net cash used by financing activities	(136,772)	(91,973)
Increase in Cash and Cash Equivalents	3,561	6,558
Cash and cash equivalents at beginning of year	15,310	14,727
Cash and cash equivalents at end of period	$ 18,871	$ 21,285