Unaudited Consolidated Statement Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities
Net income	$ 8,188	$ 49,725
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,804	17,188
Provision for uncollectible accounts receivable	8,250	8,124
Stock option expense	6,055	4,840
Benefit for deferred income taxes	(34,876)	(4,244)
Potential litigation settlement	90,000
Noncash early retirement expense		1,747
Amortization of restricted stock awards	638	974
Noncash directors' compensation	766	541
Noncash long-term incentive compensation	1,783	196
Amortization of debt issuance costs	258	260
Changes in operating assets and liabilities:
Decrease/(increase) in accounts receivable	5,804	(839)
Decrease in inventories	137	194
Increase in prepaid expenses	(1,573)	(2,605)
Decrease in accounts payable and other current liabilities	(6,931)	(4,879)
Increase in income taxes	2,982	3,109
Increase in other assets	(4,152)	(3,636)
Increase in other liabilities	3,754	4,145
Excess tax benefit on share-based compensation		(1,383)
Other sources/(uses)	1,437	(9)
Net cash provided by operating activities	100,324	73,448
Cash Flows from Investing Activities
Capital expenditures	(28,133)	(19,983)
Business combinations	(525)
Other sources	87	214
Net cash used by investing activities	(28,571)	(19,769)
Cash Flows from Financing Activities
Proceeds from long-term debt	135,800	92,400
Payments on revolving line of credit	(115,800)	(32,400)
Purchases of treasury stock	(85,063)	(94,337)
Change in cash overdrafts payable	(1,090)	(5,440)
Proceeds from exercise of stock options	10,398	3,533
Capital stock surrendered to pay taxes on stock-based compensation	(5,716)	(5,163)
Dividends paid	(8,396)	(8,039)
Payments on other long-term debt	(3,750)	(3,750)
Excess tax benefit on share-based compensation		1,383
Other sources	307	881
Net cash used by financing activities	(73,310)	(50,932)
Increase/(Decrease) in Cash and Cash Equivalents	(1,557)	2,747
Cash and cash equivalents at beginning of year	15,310	14,727
Cash and cash equivalents at end of period	$ 13,753	$ 17,474