Employee Benefit Plans - Fair Value of Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 40,973	$ 38,095	$ 30,405
Actual return on plan assets sold during the period	(36)	105
Actual return on plan assets still held	2,123	1,954
Business acquisitions	4,559	5,908
Purchases	1,409	1,987
Sales	(5,177)	(2,264)
Real estate funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,517	33,534	30,405
Actual return on plan assets sold during the period	16	(3)
Actual return on plan assets still held	2,123	2,348
Business acquisitions	3,103	0
Purchases	1,409	1,987
Sales	(668)	(1,203)
Other plan assets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,456	4,561	0
Actual return on plan assets sold during the period	(52)	108
Actual return on plan assets still held	0	(394)
Business acquisitions	1,456	5,908
Purchases	0	0
Sales	(4,509)	(1,061)
U.S. Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	554,648	515,191	409,783
Business acquisitions	0	66,243
U.S. Pension Plan, Defined Benefit [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	236,998	214,373
U.S. Pension Plan, Defined Benefit [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	288,249	269,776
U.S. Pension Plan, Defined Benefit [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29,401	31,042
U.S. Pension Plan, Defined Benefit [Member] | Equity - U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	153,939	153,816
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	153,939	153,816
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	6,478	3,065
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	6,478	3,065
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	59,293	55,716
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	59,293	55,716
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	7,238	3,791
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	7,238	3,791
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	132,604	125,141
U.S. Pension Plan, Defined Benefit [Member] | Government securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,888	9,268
U.S. Pension Plan, Defined Benefit [Member] | Government securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	112,716	115,873
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	45,376	38,476
U.S. Pension Plan, Defined Benefit [Member] | Mutual funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45,376	38,476
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	109,002	94,396
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	109,002	94,396
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	29,401	26,481
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	0	0
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	29,401	26,481
U.S. Pension Plan, Defined Benefit [Member] | Cash and equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,317	9,748
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	11,317	9,748
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
U.S. Pension Plan, Defined Benefit [Member] | Other plan assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4,561
U.S. Pension Plan, Defined Benefit [Member] | Other plan assets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] | Other plan assets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.S. Pension Plan, Defined Benefit [Member] | Other plan assets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	4,561
Non-U.S. Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	181,416	121,807	121,815
Business acquisitions	38,939	0
Non-U.S. Pension Plans, Defined Benefit [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34,648	25,708
Non-U.S. Pension Plans, Defined Benefit [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	135,196	89,046
Non-U.S. Pension Plans, Defined Benefit [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,572	7,053
Non-U.S. Pension Plans, Defined Benefit [Member] | Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31,268	23,450
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	31,268	23,450
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	57,049	36,629
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	57,049	36,629
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	75,729	49,680
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	75,729	49,680
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	10,116	7,053
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	10,116	7,053
Non-U.S. Pension Plans, Defined Benefit [Member] | Cash and equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,380	2,258
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	3,380	2,258
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	3,874	2,737
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	2,418	2,737
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	$ 1,456	$ 0