Income Taxes Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax [Line Items]
Operating Loss Carryforwards	$ 190,350,000	$ 0
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	1,500,000
Income Tax Expense (Benefit)	76,426,000	53,017,000	46,093,000
Income Tax (Benefits), Probability Threshold For Recognition, Minimum Percentage	50.00%
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	49
Unrecognized Tax Benefits, Effective Tax Rate If Fully Recognized	28.90%
Expiration of Statues of Limitation
Income Tax [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	(300,000)
2013 Tax Filings
Income Tax [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	(500,000)
Net-worth Taxes
Income Tax [Line Items]
Income Tax Expense (Benefit)	9,900,000	7,800,000	5,500,000
Federal [Member]
Income Tax [Line Items]
Operating Loss Carryforwards	543,900,000
General Business Tax Credit Carryforward [Member]
Income Tax [Line Items]
Operating Loss Carryforwards	5,700,000
Federal alternative minimum tax credits [Member]
Income Tax [Line Items]
Operating Loss Carryforwards	$ 41,900,000