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Accumulated Other Comprehensive Income Details 1 (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accumulated Other Comprehensive Income [Abstract]
Cross Currency Swap interest portion recognized in income	$ 1,043
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(62)		$ 277
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(433)		(3,710)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(495)		(3,433)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(49)		(218)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(446)		(3,215)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	3,889		4,811
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent	875		1,126
Income Tax Expense (Benefit)	13,871	$ 24,135
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,568		470
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	3,014		$ 3,685
Cross Currency Swap Revaluation Portion Recognized in Earnings	$ (610)

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Accumulated Other Comprehensive Income [Abstract]

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The amount of currency revaluation on the cross currency swap cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The amount of interest income on cross currency swap cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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