Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Measurements

Fair Value Measurement Of Assets And Liabilities On A Recurring Basis

	Fair Value Measurements at December 31, 2017
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets
Assets associated with interest rate swap contracts	$	15,621	$	—	$	15,621	$	—
Liabilities
Liabilities associated with interest rate swap contracts	$	(10,861)	$	—	$	(10,861)	$	—
Liabilities associated with acquisition-related contingent consideration	$	(42,614)	$	—	$	—	$	(42,614)

	Fair Value Measurements at December 31, 2016
	Total		Level 1		Level 2		Level 3
	(In thousands)
Assets
Assets associated with interest rate swap contracts	$	14,137	$	—	$	14,137	$	—
Liabilities
Liabilities associated with interest rate swap contracts	$	(30,989)	$	—	$	(30,989)	$	—