Acquisitions and Dispositions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquisitions and Dispositions [Abstract]
Reduction of contingent consideration liabilities	$ 0	$ 3,966,000	$ 10,620,000
Net Income Attributable to the Company and Transfers to Noncontrolling Interest
Net income (loss) attributable to the Company	(254,612,000)	(11,510,000)	6,754,000
Decrease in the Company's paid-in capital for purchase of noncontrolling interests	0	0	(1,003,000)
Change from net income (loss) attributable to the Company and transfers to noncontrolling interest	(254,612,000)	(11,510,000)	5,751,000
Business Acquisition [Line Items]
After-tax loss from discontinued operations	919,000	2,063,000	4,131,000
Assets held-for-sale, current	2,400,000	7,200,000
Gas Technologies Divestiture
Business Acquisition [Line Items]
After-tax loss from discontinued operations	$ 900,000	$ 2,100,000	$ 4,100,000