Employee Benefit Plans - Fair Value of Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 14,937	$ 11,572	$ 11,614
Actual return on plan assets sold during the period	0	(52)
Actual return on plan assets still held	2,958	359
Business acquisitions	0	4,559
Purchases	1,863	0
Sales	(1,456)	(4,908)
Real estate funds [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,937	10,116	7,053
Actual return on plan assets sold during the period	0	0
Actual return on plan assets still held	2,958	359
Business acquisitions	0	3,103
Purchases	1,863	0
Sales	0	(399)
Other plan assets [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	1,456	4,561
Actual return on plan assets sold during the period	0	(52)
Actual return on plan assets still held	0	0
Business acquisitions	0	1,456
Purchases	0	0
Sales	(1,456)	(4,509)
U.S. Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	595,143	554,648	515,191
Business acquisitions	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	278,753	236,998
U.S. Pension Plan, Defined Benefit [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	316,390	317,650
U.S. Pension Plan, Defined Benefit [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Equity - U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	180,038	153,939
U.S. Pension Plan, Defined Benefit [Member] \| Equity - U.S. Companies [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	180,038	153,939
U.S. Pension Plan, Defined Benefit [Member] \| Equity - U.S. Companies [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Equity - U.S. Companies [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Equity - Non-U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,526	6,478
U.S. Pension Plan, Defined Benefit [Member] \| Equity - Non-U.S. Companies [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,526	6,478
U.S. Pension Plan, Defined Benefit [Member] \| Equity - Non-U.S. Companies [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Equity - Non-U.S. Companies [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53,924	59,293
U.S. Pension Plan, Defined Benefit [Member] \| Corporate bonds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Corporate bonds [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53,924	59,293
U.S. Pension Plan, Defined Benefit [Member] \| Corporate bonds [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Private placements [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,374	7,238
U.S. Pension Plan, Defined Benefit [Member] \| Private placements [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Private placements [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,374	7,238
U.S. Pension Plan, Defined Benefit [Member] \| Private placements [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	112,142	132,604
U.S. Pension Plan, Defined Benefit [Member] \| Government securities [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25,035	19,888
U.S. Pension Plan, Defined Benefit [Member] \| Government securities [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	87,107	112,716
U.S. Pension Plan, Defined Benefit [Member] \| Government securities [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Mutual funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59,387	45,376
U.S. Pension Plan, Defined Benefit [Member] \| Mutual funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	59,387	45,376
U.S. Pension Plan, Defined Benefit [Member] \| Mutual funds [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Mutual funds [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Collective trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	138,236	109,002
U.S. Pension Plan, Defined Benefit [Member] \| Collective trusts [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Collective trusts [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	138,236	109,002
U.S. Pension Plan, Defined Benefit [Member] \| Collective trusts [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Real estate funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,749	29,401
U.S. Pension Plan, Defined Benefit [Member] \| Real estate funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Real estate funds [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,749	29,401
U.S. Pension Plan, Defined Benefit [Member] \| Real estate funds [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Cash and equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,767	11,317
U.S. Pension Plan, Defined Benefit [Member] \| Cash and equivalents [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,767	11,317
U.S. Pension Plan, Defined Benefit [Member] \| Cash and equivalents [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] \| Cash and equivalents [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	203,681	181,416	121,807
Business acquisitions	0	38,939
Non-U.S. Pension Plans, Defined Benefit [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41,795	34,648
Non-U.S. Pension Plans, Defined Benefit [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	146,949	135,196
Non-U.S. Pension Plans, Defined Benefit [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,937	11,572
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,010	31,268
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stocks [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	35,010	31,268
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stocks [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stocks [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Fixed income investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,574	57,049
Non-U.S. Pension Plans, Defined Benefit [Member] \| Fixed income investments [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Fixed income investments [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,574	57,049
Non-U.S. Pension Plans, Defined Benefit [Member] \| Fixed income investments [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stock funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66,285	75,729
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stock funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stock funds [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66,285	75,729
Non-U.S. Pension Plans, Defined Benefit [Member] \| Common stock funds [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Real estate funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,937	10,116
Non-U.S. Pension Plans, Defined Benefit [Member] \| Real estate funds [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Real estate funds [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Real estate funds [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,937	10,116
Non-U.S. Pension Plans, Defined Benefit [Member] \| Cash and equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,785	3,380
Non-U.S. Pension Plans, Defined Benefit [Member] \| Cash and equivalents [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,785	3,380
Non-U.S. Pension Plans, Defined Benefit [Member] \| Cash and equivalents [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Cash and equivalents [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Other plan assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,090	3,874
Non-U.S. Pension Plans, Defined Benefit [Member] \| Other plan assets [Member] \| Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Pension Plans, Defined Benefit [Member] \| Other plan assets [Member] \| Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,090	2,418
Non-U.S. Pension Plans, Defined Benefit [Member] \| Other plan assets [Member] \| Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 1,456