Summary of Significant Accounting Policies, Concentration of Credit Risk (Details) (Net Receivables [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Slovenske elektrarne, a.s. [Member]
Receivable by major customers [Abstract]
Percentage of receivables contributed by major customers (in hundredths)	35.90%	17.40%
Shandong Nuclear Power Co. Ltd. [Member]
Receivable by major customers [Abstract]
Percentage of receivables contributed by major customers (in hundredths)	8.10%	13.80%