Income Taxes (Other Disclosure) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ (10,000,000)
Deferred Tax Assets, Operating Loss Carryforwards	21,600,000	22,200,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	8,700,000	6,100,000	16,600,000
Tax benefit (detriment) related to equity compensation plans	1,096,000	(1,376,000)	5,130,000
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2034
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Goodwill and Intangible Assets	0
Federal Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	6,100,000
State Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	270,600,000
Additional Paid-In Capital [Member]
Operating Loss Carryforwards [Line Items]
Tax benefit (detriment) related to equity compensation plans	1,096,000	(1,376,000)	5,130,000
Capital Loss Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 6,000,000