Significant Accounting Policies (Share-Based Compensation Expense) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Share-based compensation expense	$ 29,930,000	$ 28,893,000	$ 27,602,000
Tax benefit recognized for share-based compensation arrangements	11,600,000	11,200,000	10,700,000
Excess tax benefit on share-based compensation	$ 620,000	$ 6,089,000	$ 1,349,000