CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES
Customer services	$ 1,411,566us-gaap_SalesRevenueServicesNet	$ 1,337,374us-gaap_SalesRevenueServicesNet	$ 1,270,909us-gaap_SalesRevenueServicesNet
COSTS AND EXPENSES
Cost of services provided	707,739us-gaap_CostOfServices	678,459us-gaap_CostOfServices	647,578us-gaap_CostOfServices
Depreciation and amortization	43,509	39,571	38,655
Sales, general and administrative	441,706	428,288	407,488
Gain on sales of assets, net	(618)us-gaap_GainLossOnDispositionOfAssets	(165)us-gaap_GainLossOnDispositionOfAssets	(468)us-gaap_GainLossOnDispositionOfAssets
Pension settlement loss			1,000us-gaap_PensionExpense
Interest (income)/expense	(254)us-gaap_InterestIncomeExpenseNet	(385)us-gaap_InterestIncomeExpenseNet	14us-gaap_InterestIncomeExpenseNet
TOTAL COSTS AND EXPENSES	1,192,082	1,145,768	1,094,267
INCOME BEFORE INCOME TAXES	219,484	191,606	176,642
PROVISION FOR INCOME TAXES
Current	73,380us-gaap_CurrentIncomeTaxExpenseBenefit	67,920us-gaap_CurrentIncomeTaxExpenseBenefit	67,180us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred	8,440us-gaap_DeferredIncomeTaxExpenseBenefit	356us-gaap_DeferredIncomeTaxExpenseBenefit	(1,870)us-gaap_DeferredIncomeTaxExpenseBenefit
TOTAL PROVISION FOR INCOME TAXES	81,820us-gaap_IncomeTaxExpenseBenefit	68,276us-gaap_IncomeTaxExpenseBenefit	65,310us-gaap_IncomeTaxExpenseBenefit
NET INCOME	$ 137,664	$ 123,330	$ 111,332
INCOME PER SHARE - BASIC (in dollars per share)	$ 0.94us-gaap_EarningsPerShareBasic	$ 0.84us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic
INCOME PER SHARE - DILUTED (in dollars per share)	$ 0.94us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted	$ 0.76us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding - basic (in shares)	145,796	146,081	146,299
Weighted average shares outstanding - diluted (in shares)	145,796	146,081	146,299
DIVIDENDS PAID PER SHARE (in dollars per share)	$ 0.52	$ 0.45	$ 0.44

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