Accumulated Other Comprehensive Loss (After-tax Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019		Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	$ (6,387)		$ (2,700)
Other comprehensive income (loss) before reclassifications	[1]	(2,770)		(1,120)
Amounts reclassified from accumulated other comprehensive loss (b)	[1]	11,631		(168)
Net current-period other comprehensive income (loss)	[1]	8,861		(1,288)
Ending balance	[1]	2,474		(3,988)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	(126)
Other comprehensive income (loss) before reclassifications	[1]	(3,758)
Amounts reclassified from accumulated other comprehensive loss (b)		136
Net current-period other comprehensive income (loss)	[1]	(3,622)
Ending balance	[1]	(3,748)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	(11,550)		(7,716)
Other comprehensive income (loss) before reclassifications	[1]	943		(1,150)
Amounts reclassified from accumulated other comprehensive loss (b)	[1]	11,666		0
Net current-period other comprehensive income (loss)	[1]	12,609		(1,150)
Ending balance	[1]	1,059		(8,866)
Investment in Convertible Preferred Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance		258	[1]	344
Other comprehensive income (loss) before reclassifications		0	[1]	(87)
Amounts reclassified from accumulated other comprehensive loss (b)		0	[1]	0
Net current-period other comprehensive income (loss)		0	[1]	(87)
Ending balance		258	[1]	257
Defined Benefit Plan Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	[1]	5,031		4,672
Other comprehensive income (loss) before reclassifications	[1]	45		117
Amounts reclassified from accumulated other comprehensive loss (b)	[1]	(171)		(168)
Net current-period other comprehensive income (loss)	[1]	(126)		(51)
Ending balance	[1]	$ 4,905		$ 4,621

[1] All amounts are net of tax. Amounts in parentheses indicate debits