Common Shares, Compensation Plans And Preferred Shares (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Common Shares, Compensation Plans And Preferred Shares [Line Items]
Share-based compensation	$ 24,600,000	$ 30,600,000	$ 62,778,000	$ 32,443,000
Shares reserved for stock options and warrants	7,117,322		7,117,322		7,124,429
Total unrecognized compensation cost related to nonvested share-based awards	141,700,000		141,700,000
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition			2 years 2 months 12 days
Potential maximum increase to common shares outstanding from restricted stock and other shares	13,741,760		13,741,760
Tax benefit in results of operations for issuance of share-based awards	$ 8,900,000	$ 11,100,000	$ 22,900,000	$ 11,600,000
Other Shares Issuable [Member]
Common Shares, Compensation Plans And Preferred Shares [Line Items]
Other shares issuable	910,635		910,635
Restricted Stock [Member]
Common Shares, Compensation Plans And Preferred Shares [Line Items]
Restricted shares, Outstanding	4,626,736		4,626,736
Future Service Required [Member] | Restricted Stock Units [Member]
Common Shares, Compensation Plans And Preferred Shares [Line Items]
Restricted shares, Outstanding	4,402,551		4,402,551
No Future Service Required [Member] | Restricted Stock Units [Member]
Common Shares, Compensation Plans And Preferred Shares [Line Items]
Restricted shares, Outstanding	8,428,574		8,428,574