Nature Of Business And Summary Of Significant Accounting Policies (Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, January 1	$ 1,120	$ 1,112
Change in fair value and accretion	8	8
Balance, December 31	1,128	1,120
Contingent Purchase Consideration
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, January 1	375	3,023
Change in fair value and accretion	(277)	(2,648)
Balance, December 31	$ 98	$ 375