Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Pension and postretirement benefits [Abstract]
Amortization of net actuarial loss, Gross Amount	$ 7,675	[1]	$ 6,791	[1]	$ 2,275	[1]
Amortization of net actuarial loss, Income Tax (Provision) Benefit	(2,942)	[1]	(2,603)	[1]	(871)	[1]
Amortization of net actuarial loss, Net Amount	4,733	[1]	4,188	[1]	1,404	[1]
Actuarial gains, Gross Amount	62,503	[1]	(23,443)	[1]	(46,652)	[1]
Actuarial gains, Income Tax (Provision) Benefit	(23,962)	[1]	8,985	[1]	17,865	[1]
Actuarial gains, Net Amount	38,541	[1]	(14,458)	[1]	(28,787)	[1]
Foreign currency translation adjustments, Gross Amount	108		102		(350)
Foreign currency translation adjustments, Income Tax (Provision) Benefit	0		0		0
Foreign currency translation adjustments, Net Amount	108		102		(350)
Change in fair value of derivative instruments [Abstract]
Unrealized gains (losses), Gross Amount	2,851	[2]	16,364	[2]	16,713	[2]
Unrealized gains, Income Tax (Provision) Benefit	(996)	[2]	(5,775)	[2]	(6,004)	[2]
Unrealized gains, Net Amount	1,855	[2]	10,589	[2]	10,709	[2]
Reclassified to net earnings, Gross Amount	(1,389)	[2]	(8,302)	[2]	(8,599)	[2]
Reclassified to net earnings, Income Tax (Provision) Benefit	486	[2]	2,930	[2]	3,089	[2]
Reclassified to net earnings, Net Amount	(903)	[2]	(5,372)	[2]	(5,510)	[2]
Total other comprehensive income (loss), Gross Amount	71,748	[2]	(8,488)	[2]	(36,613)	[2]
Total other comprehensive income (loss), Income Tax (Provision) Benefit	(27,414)	[2]	3,537	[2]	14,079	[2]
Total comprehensive income (loss), net of taxes	$ 44,334	[2]	$ (4,951)	[2]	$ (22,534)	[2]

[1] Actuarial gains (losses) are amortized into costs of sales and operating expenses or selling, general and administrative expenses as appropriate. (See Note 10 – Retirement Plans)

[2] Reclassifications to net earnings of derivatives qualifying as effective hedges are recognized in interest expense or costs of sales and operating expenses as appropriate. (See Note 5 – Derivative Instruments)