Employee and Retiree Benefit Plans (Fair Value Measurements of Retirement Plan Assets within Fair Value of Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 560,978	$ 533,108
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	358,673	344,533
Domestic Plans [Member] | Equity securities [Member] | US core equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	67,863	89,255
Domestic Plans [Member] | Equity securities [Member] | U.S. small/midcap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	33,709	37,149
Domestic Plans [Member] | Equity securities [Member] | Hedged funds and other alternative strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	52,905	32,788
Domestic Plans [Member] | Equity securities [Member] | Commingled equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	19,908	9,654
Domestic Plans [Member] | Equity securities [Member] | Commingled trust fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	75,702	77,041
Domestic Plans [Member] | Fixed Income Securities [Member] | Commingled trust fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	17,559	14,865
Domestic Plans [Member] | Fixed Income Securities [Member] | U.S. fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	80,577	72,240
Domestic Plans [Member] | Fixed Income Securities [Member] | Mutual fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	8,069	8,549
Domestic Plans [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,381	2,992
Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	202,305	188,575
Foreign Plans [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		99,085
Foreign Plans [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		57,030
Foreign Plans [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,363	1,660
Foreign Plans [Member] | Equity securities funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	106,694
Foreign Plans [Member] | Fixed income securities funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	66,435
Foreign Plans [Member] | Diversified pooled fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	27,813	30,800
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	105,316	131,056
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	103,953	129,396
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Domestic Plans [Member] | Equity securities [Member] | US core equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	67,863	89,255
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Domestic Plans [Member] | Equity securities [Member] | U.S. small/midcap [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	33,709	37,149
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Domestic Plans [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,381	2,992
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,363	1,660
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Plans [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,363	1,660
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	421,710	369,264
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	220,768	182,349
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member] | Equity securities [Member] | Hedged funds and other alternative strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	18,953
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member] | Equity securities [Member] | Commingled equity fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	19,908	9,654
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member] | Equity securities [Member] | Commingled trust fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	75,702	77,041
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member] | Fixed Income Securities [Member] | Commingled trust fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	17,559	14,865
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member] | Fixed Income Securities [Member] | U.S. fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	80,577	72,240
Significant Other Observable Inputs (Level 2) [Member] | Domestic Plans [Member] | Fixed Income Securities [Member] | Mutual fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	8,069	8,549
Significant Other Observable Inputs (Level 2) [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	200,942	186,915
Significant Other Observable Inputs (Level 2) [Member] | Foreign Plans [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		99,085
Significant Other Observable Inputs (Level 2) [Member] | Foreign Plans [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		57,030
Significant Other Observable Inputs (Level 2) [Member] | Foreign Plans [Member] | Equity securities funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	106,694
Significant Other Observable Inputs (Level 2) [Member] | Foreign Plans [Member] | Fixed income securities funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	66,435
Significant Other Observable Inputs (Level 2) [Member] | Foreign Plans [Member] | Diversified pooled fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	27,813	30,800
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	33,952	32,788
Significant Unobservable Inputs (Level 3) [Member] | Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	33,952	32,788
Significant Unobservable Inputs (Level 3) [Member] | Domestic Plans [Member] | Equity securities [Member] | Hedged funds and other alternative strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 33,952	$ 32,788