Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated other comprehensive loss, net of tax
Beginning balance	$ (716,118)	$ (643,093)
Net current period change	103
Amounts reclassified from AOCI	(35,816)
Ending balance	(852,864)	(765,182)
Cumulative Translation Adjustment
Accumulated other comprehensive loss, net of tax
Beginning balance	(22,184)
Amounts reclassified from AOCI	(17,971)
Ending balance	(40,155)
Cash Flow Hedges
Accumulated other comprehensive loss, net of tax
Beginning balance	(1,530)
Net current period change	(120)
Amounts reclassified from AOCI	(28,794)
Ending balance	(30,444)
Defined Benefit Plans
Accumulated other comprehensive loss, net of tax
Beginning balance	(49,282)
Net current period change	257
Ending balance	(49,025)
Income Taxes
Accumulated other comprehensive loss, net of tax
Beginning balance	(1,714)
Net current period change	(34)
Amounts reclassified from AOCI	10,949
Ending balance	9,201
Accumulated other comprehensive loss
Accumulated other comprehensive loss, net of tax
Beginning balance	(74,710)	(71,498)
Ending balance	$ (110,423)	$ (70,266)