Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2018

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table presents changes in accumulated other comprehensive income by component for the six months ended June 30, 2018 and 2017:

	Currency Translation Adjustment, Net of Tax			Net Unrealized Gain (Loss) on Cash Flow Hedging Arrangements, Net of Tax			Pension and Post-Retirement Benefit Related Items, Net of Tax			Total
Balance at December 31, 2017	$	(31,340	)	$	(1,081	)	$	(232,985	)	$	(265,406	)
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) cash flow hedging arrangements	—			1,782			—			1,782
Foreign currency translation adjustment	(13,894		)	—			3,865			(10,029		)
Amounts recognized from accumulated other comprehensive income (loss), net of tax	—			682			7,250			7,932
Net change in other comprehensive income (loss), net of tax	(13,894		)	2,464			11,115			(315		)
Balance at June 30, 2018	$	(45,234	)	$	1,383		$	(221,870	)	$	(265,721	)

Disclosure of Reclassification Amount [Text Block]

The following table presents amounts recognized from accumulated other comprehensive income (loss) for the three and six month periods ended June 30:

	Three months ended June 30,
	2018		2017		Location of Amounts Recognized in Earnings
Effective portion of (gains) / losses on cash flow hedging arrangements:
Interest rate swap agreements	$	158	$	505	Interest expense
Cross currency swap agreement	4,098		1,412		(a)
Total before taxes	4,256		1,917
Provision for taxes	360		305		Provision for taxes
Total, net of taxes	$	3,896	$	1,612
Recognition of defined benefit pension and post-retirement items:
Recognition of actuarial losses and prior service cost, before taxes	$	4,687	$	5,054	(b)
Provision for taxes	1,123		1,301		Provision for taxes
Total, net of taxes	$	3,564	$	3,753

Schedule of Comprehensive Income (Loss) [Table Text Block]

Comprehensive income (loss), net of tax consisted of the following as of June 30:

	Three Months Ended					Six Months Ended
	2018			2017		2018			2017
Net earnings	$	111,468		$	101,580	$	204,772		$	194,046
Other comprehensive income (loss), net of tax	(29,205		)	32,734		(315		)	56,612
Comprehensive income, net of tax	$	82,263		$	134,314	$	204,457		$	250,658