Common Stock (Schedule of Restricted Stock Tax Expense and Deferred Tax) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred tax benefit	$ 44,678,000		$ 43,561,000		$ 45,688,000
Capitalized Costs Related to Restricted Stock Award or Unit Expense	100,000		100,000		100,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	2,458,000	[1]	1,508,000	[1]	2,258,000	[1]
Deferred tax benefit	860,000		528,000		790,000
Current tax expense (benefit) recognized	$ 109,000		$ 94,000		$ 518,000

[1] Any capitalized costs related to these expenses is less than $0.1 million for all years.