Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Contingency [Line Items]
Effective tax rate			52.70%	17.00%	13.50%
Income taxes	$ 23,218	$ 3,783	$ 27,417	$ 7,584
2013 U.S Court Decision [Member]
Income Tax Contingency [Line Items]
Effective tax rate			20.80%
Income taxes	$ 16,569
Aerospace [Member]
Income Tax Contingency [Line Items]
Tax incentives scheduled to expire in 2013	0		0