Guarantor Subsidiaries (Schedule Of Guarantor Subsidiaries - Statement Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	$ 135,858	$ 77,337
Capital expenditures	(18,887)	(26,489)
Business combinations, net of cash acquired	(2,210)	(5,900)
Other sources/(uses) - net	139	528
Net cash provided/(used) by investing activities	(20,958)	(31,861)
Increase/(decrease) in cash overdrafts payable	(10,928)	(3,299)
Dividends paid	(10,459)	(9,641)
Debt issuance costs	(1,108)
Capital stock surrendered to pay taxes on stock-based compensation	(4,280)	(3,236)
Purchases of treasury stock	(89,611)	(11,724)
Proceeds from exercise of stock options	13,125	10,483
Excess tax benefit on share-based compensation	2,507	2,714
Other sources/(uses) - net	(473)	442
Net cash provided/(used) by financing activities	(101,227)	(14,261)
Net increase/(decrease) in cash and cash equivalents	13,673	31,215
Cash and cash equivalents at beginning of year	69,531	38,081
Cash and cash equivalents at end of period	83,204	69,296
Parent [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	16,336	1,486
Capital expenditures	(96)	(196)
Other sources/(uses) - net	(53)	201
Net cash provided/(used) by investing activities	(149)	5
Increase/(decrease) in cash overdrafts payable	5,378	(4,580)
Change in intercompany accounts	96,731	40,489
Dividends paid	(10,459)	(9,641)
Debt issuance costs	(1,108)
Capital stock surrendered to pay taxes on stock-based compensation	(4,280)	(3,236)
Purchases of treasury stock	(89,611)	(11,724)
Proceeds from exercise of stock options	13,125	10,483
Excess tax benefit on share-based compensation	2,507	2,714
Other sources/(uses) - net	30	(17)
Net cash provided/(used) by financing activities	12,313	24,488
Net increase/(decrease) in cash and cash equivalents	28,500	25,979
Cash and cash equivalents at beginning of year	56,342	32,470
Cash and cash equivalents at end of period	84,842	58,449
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	118,998	74,206
Capital expenditures	(18,297)	(25,491)
Business combinations, net of cash acquired	(2,210)	(5,900)
Other sources/(uses) - net	171	359
Net cash provided/(used) by investing activities	(20,336)	(31,032)
Increase/(decrease) in cash overdrafts payable	(16,306)	1,281
Change in intercompany accounts	(97,541)	(40,022)
Other sources/(uses) - net		(1)
Net cash provided/(used) by financing activities	(113,847)	(38,742)
Net increase/(decrease) in cash and cash equivalents	(15,185)	4,432
Cash and cash equivalents at beginning of year	4,674	(1,422)
Cash and cash equivalents at end of period	(10,511)	3,010
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities	524	1,645
Capital expenditures	(494)	(802)
Other sources/(uses) - net	21	(32)
Net cash provided/(used) by investing activities	(473)	(834)
Change in intercompany accounts	810	(467)
Other sources/(uses) - net	(503)	460
Net cash provided/(used) by financing activities	307	(7)
Net increase/(decrease) in cash and cash equivalents	358	804
Cash and cash equivalents at beginning of year	8,515	7,033
Cash and cash equivalents at end of period	$ 8,873	$ 7,837