Commitments and Contingencies - Asbestos Claimant and Settlement (Details) (Asbestos [Member], USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013 claimants	Dec. 31, 2012 claimants
Asbestos [Member]
Loss Contingencies [Line Items]
Number of pending claims at the beginning of period	7,880	8,048
Number of pending claims filed during period	188	367
Number of pending claims dismissed during period	146	519
Number of pending claims settled during period	25	16
Average settlement amount per claim during period	$ 1,888	$ 14,513
Total defense costs during period	$ 1,365,000	$ 2,650,000