Segment Information (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Segment Information [Abstract]
Number of segments	6
Revenues derived from any customer did not exceed 10% of consolidated revenues	$ 0	$ 0	$ 0
Segment Reporting Information [Line Items]
Total assets	836,781	796,226
Japan [Member]
Segment Reporting Information [Line Items]
Total assets	$ 111,000	$ 103,900
Percent of total assets from Japan operations	13.00%	13.00%