Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
REVENUE	$ 570,779,000	$ 565,490,000
COST OF SERVICES	241,012,000	239,701,000
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	220,843,000	215,096,000
OPERATING INCOME	108,924,000	110,693,000
OTHER INCOME (EXPENSE):
Interest expense, net of interest income of $269 and $26	(38,483,000)	(38,842,000)
Other, net	(1,040,000)	3,839,000
Other expense	(39,523,000)	(35,003,000)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAX EXPENSE	69,401,000	75,690,000
INCOME TAX EXPENSE ATTRIBUTED TO CONTINUING OPERATIONS	24,846,000	27,056,000
INCOME FROM CONTINUING OPERATIONS	44,555,000	48,634,000
INCOME FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES	0	31,866,000
NET INCOME	$ 44,555,000	$ 80,500,000
EARNINGS PER COMMON SHARE-BASIC:
Continuing Operations	$ 0.54	$ 0.58
Discontinued Operations		0.38
Total Earnings Per Common Share-Basic	0.54	0.96
EARNINGS PER COMMON SHARE-DILUTED:
Continuing Operations	0.53	0.56
Discontinued Operations		0.37
Total Earnings Per Common Share-Diluted	$ 0.53	$ 0.93
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING:
Basic Common	83,149	84,125
Diluted Common	84,615	86,226
DIVIDENDS DECLARED:
Dividends declared per share	$ 0.225	$ 0.225