Pension and Other Postretirement Benefits (Details 9) In Thousands, unless otherwise specified	12 Months Ended						12 Months Ended								12 Months Ended
	Dec. 31, 2012 U.S. Pension Benefits [Member] USD ($)		Dec. 31, 2011 U.S. Pension Benefits [Member] USD ($)		Dec. 31, 2012 U.S. Pension Benefits [Member] Fair value, Level 3 plan assets [Member] USD ($)	Dec. 31, 2011 U.S. Pension Benefits [Member] Fair value, Level 3 plan assets [Member] USD ($)	Dec. 31, 2012 U.S. Pension Benefits [Member] Fair value, Level 3 plan assets [Member] Managed Funds [Member] USD ($)	Dec. 31, 2011 U.S. Pension Benefits [Member] Fair value, Level 3 plan assets [Member] Managed Funds [Member] USD ($)	Dec. 31, 2012 U.S. Pension Benefits [Member] Fair value, Level 3 plan assets [Member] Hedge and absolute return funds [Member] USD ($)	Dec. 31, 2011 U.S. Pension Benefits [Member] Fair value, Level 3 plan assets [Member] Hedge and absolute return funds [Member] USD ($)	Dec. 31, 2012 Foreign Pension Benefits [Member] USD ($)	Dec. 31, 2011 Foreign Pension Benefits [Member] USD ($)	Dec. 31, 2012 Foreign Pension Benefits [Member] GBP (£)	Dec. 31, 2011 Foreign Pension Benefits [Member] GBP (£)	Dec. 31, 2012 Foreign Pension Benefits [Member] Fair value, Level 3 plan assets [Member] USD ($)	Dec. 31, 2011 Foreign Pension Benefits [Member] Fair value, Level 3 plan assets [Member] USD ($)
Change in plan assets:
Fair value of plan assets, Beginning balance	$ 133,403	[1]	$ 135,730	[1]	$ 36,554	$ 35,220	$ 29,280	$ 0	$ 5,940	$ 5,951	$ 36,436	$ 34,836	£ 25,774	£ 23,443	$ 3,324	$ 3,211
Acquisitions							0	28,433	0	0					5,191	25
Withdrawals							(1,919)		0						(87)
Change in net unrealized gain	17,289	[1]	16,121	[1]			2,703	847	550	(11)	5,239	2,321			333	100
Other, primarily impact from changes in foreign currency exchange rates	0	[1]	0	[1]			0	0	0	0	1,734	(184)			270	(12)
Fair value of plan assets, Ending Balance	$ 140,218	[1]	$ 133,403	[1]	$ 36,554	$ 35,220	$ 30,064	$ 29,280	$ 6,490	$ 5,940	$ 41,875	$ 36,436	£ 25,774	£ 23,443	$ 9,031	$ 3,324

[1] Includes the non-qualified defined benefit pension plan.