Comprehensive Income (Tables)

12 Months Ended

Dec. 31, 2017

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest [Abstract]

Schedule of accumulated other comprehensive income (loss), net of income tax

Changes in accumulated other comprehensive income or loss (“AOCI”) by component, net of income tax, consisted of the following:

	Year ended December 31, 2017
(in thousands)	Foreign Currency Translation			Pension Plan and SERP Liability			Total Accumulated Other Comprehensive (Loss) Income
Balance - beginning of year	$	(324,708	)	$	(38,993	)	$	(363,701	)
Other comprehensive income (loss) before reclassifications		353,468			(1,507	)		351,961
Amounts reclassified from AOCI		—			(2,069	)		(2,069	)
Net current period other comprehensive income (loss)		353,468			(3,576	)		349,892
Balance - end of year	$	28,760		$	(42,569	)	$	(13,809	)
	Year ended December 31, 2016
(in thousands)	Foreign Currency Translation			Pension Plan and SERP Liability			Total Accumulated Other Comprehensive (Loss) Income
Balance - beginning of year	$	(98,239	)	$	(31,994	)	$	(130,233	)
Other comprehensive loss before reclassifications		(226,469	)		(11,066	)		(237,535	)
Amounts reclassified from AOCI		—			4,067			4,067
Net current period other comprehensive loss		(226,469	)		(6,999	)		(233,468	)
Balance - end of year	$	(324,708	)	$	(38,993	)	$	(363,701	)
	Year ended December 31, 2015
(in thousands)	Foreign Currency Translation			Pension Plan and SERP Liability			Total Accumulated Other Comprehensive (Loss) Income
Balance - beginning of year	$	(25,122	)	$	(32,769	)	$	(57,891	)
Other comprehensive (loss) income before reclassifications		(73,117	)		2,653			(70,464	)
Amounts reclassified from AOCI		—			(1,878	)		(1,878	)
Net current period other comprehensive (loss) income		(73,117	)		775			(72,342	)
Balance - end of year	$	(98,239	)	$	(31,994	)	$	(130,233	)