Income Taxes (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Valuation allowance	$ 14,800,000	$ 14,600,000
Increase in valuation allowance	200,000
Net deferred tax asset	712,130,000	744,646,000
No Expiration Date [Member]
Income Tax Contingency [Line Items]
Net deferred tax asset	194,500,000
Period from Twenty Twety Eight Throught Twenty Thirty Two [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, subject to expiration	422,700,000
Period from Twenty Thirteen Through Twenty Thirty Two [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, subject to expiration	24,700,000
State and Local Jurisdiction [Member] | Period from Twenty Eighteen Through Twenty Thirty Two [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards, subject to expiration	62,100,000
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Tax credit carryforwards, alternative minimum tax	$ 22,900,000