Investments (Other Long Term Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Long-Term Investments	$ 175,661	$ 191,545
Joint Ventures And Limited Partnerships [Member]
Other Long-Term Investments	43,925	39,443
Other Investments [Member]
Other Long-Term Investments	$ 131,736	$ 152,102