Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis as of the respective balance sheet dates:

	Balance Sheet	December 31, 2018								December 31, 2017
(In thousands)	Classifications	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Foreign exchange    derivative assets	Prepaid expenses    and other    current assets	$	0	$	262	$	0	$	262	$	0	$	1,136	$	0	$	1,136
1.25% Call Option	Other assets		0		0		9,104		9,104		0		0		46,578		46,578
Total assets		$	0	$	262	$	9,104	$	9,366	$	0	$	1,136	$	46,578	$	47,714
Contingent consideration	Accrued expenses	$	0	$	0	$	10,528	$	10,528	$	0	$	0	$	1,950	$	1,950
Contingent consideration	Other liabilities		0		0		15,317		15,317		0		0		5,086		5,086
1.25% Embedded    cash conversion    option	Other liabilities		0		0		9,974		9,974		0		0		47,777		47,777
Total liabilities		$	0	$	0	$	35,819	$	35,819	$	0	$	0	$	54,813	$	54,813

Summary of Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis

The changes in Level 3 assets and liabilities measured at fair value on a recurring basis at December 31, 2018 are summarized as follows:

(In thousands)	Contingent Consideration			1.25% Notes Call Spread Overlay
Balance at December 31, 2016	$	5,285		$	(579	)
Additions		1,923			0
Payments		(171	)		0
Fair value adjustments		(1	)		(620	)
Balance at December 31, 2017		7,036			(1,199	)
Additions		24,551			0
Payments		(6,067	)		0
Fair value adjustments		325			329
Balance at December 31, 2018	$	25,845		$	(870	)