Income Taxes (Other Disclosure) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ (9,100,000)
Deferred Tax Assets, Operating Loss Carryforwards	20,800,000	$ 21,600,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	10,500,000	8,700,000	$ 6,100,000
Tax (benefit) detriment related to equity compensation plans	$ 4,691,000	1,096,000	(1,376,000)
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2035
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	270,500,000
Additional Paid-In Capital [Member]
Operating Loss Carryforwards [Line Items]
Tax (benefit) detriment related to equity compensation plans	$ 4,691,000	$ 1,096,000	$ (1,376,000)