Shareholders' Equity And Stock Incentive Plan (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted		0	0	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 0	$ 0
Sale of common stock in an underwritten public offering, value		189,686,000
Proceeds from common stock offerings, net of offering costs	189,700,000	189,686,000	0	0
Issuance of warrants to purchase of common stock		0	31,983	28,576
Investment warrants, exercise price			$ 22.09
Number of stock options, restricted stock and restricted stock units granted, covering, shares, net of forfeitures	36,353	36,353	242,854	263,354	414,854
Share-based compensation arrangement by share-based payment award, Options, exercises in period, total intrinsic value		4,400,000	400,000	3,600,000
Employee service share-based compensation, cash received from exercise of stock options		1,300,000	100,000	100,000
Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of grant awards under Incentive Plan	7,245,000	7,245,000
Number of stock options, restricted stock and restricted stock units granted, covering, shares, net of forfeitures	5,931,933	5,931,933
Restricted Stock Award And Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized	25,200,000	25,200,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		2 years 1 month 17 days
Cash Settled Stock Appreciation Rights Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized	4,500,000	4,500,000
Issuance of cash stock appreciation rights		282,296	193,336	153,801
Liability for cash stock appreciation rights		20,600,000	7,200,000
Liability for cash stock appreciation rights, classified as other accrued liabilities		19,300,000	6,500,000
Liability for cash stock appreciation rights remainder, classified as other long term liabilities		1,300,000	700,000
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards		$ 3,900,000	$ 100,000	$ 100,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition		2 years 2 months 22 days
Underwriter [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock offerings, net of offering costs, shares	4,500,000
Underwritten public offering price	$ 42.24