CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
REVENUE	$ 672,695	$ 661,895	$ 1,332,919	$ 1,300,957
COST OF SERVICES	311,939	307,286	621,006	598,988
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES	226,018	233,110	483,885	466,228
OPERATING INCOME	134,738	121,499	228,028	235,741
OTHER INCOME (EXPENSE):
Interest expense, net of interest income of $100, $82, $164 and $184	(57,190)	(60,625)	(130,068)	(122,687)
Subordinated debt call premium and accelerated amortization of deferred financing costs	(6,603)		(23,105)
Other	(1,077)	(1,691)	(99)	1,039
Other expense	(64,870)	(62,316)	(153,272)	(121,648)
INCOME BEFORE INCOME TAX EXPENSE	69,868	59,183	74,756	114,093
INCOME TAX EXPENSE	26,200	22,489	28,033	43,355
NET INCOME	$ 43,668	$ 36,694	$ 46,723	$ 70,738
EARNINGS PER COMMON SHARE:
Basic Common	$ 0.52	$ 0.60	$ 0.63	$ 1.15
Diluted Common	$ 0.51	$ 0.58	$ 0.62	$ 1.11
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING:
Basic	83,524	61,384	73,716	61,345
Diluted	84,943	63,565	75,151	63,525
DIVIDENDS DECLARED:
Dividends Declared Per Share	$ 0.225		$ 0.225