Significant Accounting Policies (Cash and Cash Equivalents, Investments and Fair Value Of Financial Instruments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Checks outstanding	$ 0	$ 23,800,000
Losses recognized from other-than-temporary impairments	0	0	0
Fair value of fixed rate borrowings	434,500,000	424,000,000
Fair value of variable rate borrowings	$ 100,000,000	$ 100,000,000