Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net income	$ 99,967	$ 8,188
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,046	17,804
Stock option expense	7,305	6,055
Noncash long-term incentive compensation	2,942	1,783
Provision/(benefit) for deferred income taxes	2,173	(34,876)
Noncash directors' compensation	766	766
Amortization of restricted stock awards	446	638
Amortization of debt issuance costs	288	258
Litigation settlement		90,000
Provision for uncollectible accounts receivable		8,250
Changes in operating assets and liabilities:
(Increase)/decrease in accounts receivable	(6,057)	5,804
(Increase)/decrease in inventories	(362)	137
Increase in prepaid expenses	(113)	(1,573)
Decrease in accounts payable and other current liabilities	(14,909)	(6,931)
Change in current income taxes	10,136	2,982
Increase in other assets	(5,667)	(4,152)
Increase in other liabilities	4,889	3,754
Other sources	186	1,437
Net cash provided by operating activities	121,036	100,324
Cash Flows from Investing Activities
Capital expenditures	(23,872)	(28,133)
Business combinations	(1,875)	(525)
Other sources	533	87
Net cash used by investing activities	(25,214)	(28,571)
Cash Flows from Financing Activities
Proceeds from revolving line of credit	358,350	135,800
Payments on revolving line of credit	(281,150)	(115,800)
Purchases of treasury stock	(84,304)	(85,063)
Payments on other long-term debt	(75,000)	(3,750)
Capital stock surrendered to pay taxes on stock-based compensation	(21,022)	(5,716)
Proceeds from exercise of stock options	20,209	10,398
Dividends paid	(9,016)	(8,396)
Debt issuance costs	(968)
Change in cash overdrafts payable	(711)	(1,090)
Other (uses)/sources	(663)	307
Net cash used by financing activities	(94,275)	(73,310)
Increase/(Decrease) in Cash and Cash Equivalents	1,547	(1,557)
Cash and cash equivalents at beginning of year	11,121	15,310
Cash and cash equivalents at end of period	$ 12,668	$ 13,753

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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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- Definition

Amount of cash outflow for the payment of debt classified as other, maturing after one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

+ References

+ Details

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