Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Measurements [Abstract]

Fair Value Of Financial Instruments Measured On A Recurring Basis

			Quoted in				Significant
	Balance at		Markets		Significant Other		Unobservable
	September 30,		Identical		Observable Inputs		Inputs
Description	2016		(Level 1)		(Level 2)		(Level 3)
Interest rate swap and cap agreements	$	(6,424)	$	—	$	(6,424)	$	—
Contingent consideration obligations		—		—		—		—
Total	$	(6,424)	$	—	$	(6,424)	$	—

Reconciliation Of The Fair Value Of The Liabilities That Use Significant Unobservable Inputs (Level 3)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016			2015
Balance at beginning of period	$	(4,650)	$	(9,310)	$	(4,650)	$	(17,486)
Adjustment of provisional amounts		—		—		—		(50)
Settlement of contingent consideration		—		—		—		8,061
Gain/ (loss) included in contingent consideration		—		4,660		—		4,825
Transfers out of Level 3 fair value measurements		4,650		—		4,650		—
Balance at end of period	$	—	$	(4,650)	$	—	$	(4,650)

Carrying Amount And The Estimated Fair Value Of Financial Instruments

	Carrying
	Amount		Fair Value
Cash and cash equivalents	$	92,449	$	92,449
Accounts receivable	$	276,378	$	276,378
Senior Credit Facilities (Level 1)	$	1,769,625	$	1,791,643
Senior Notes (Level 2)	$	981,795	$	1,062,969