Fair Values of Financial Instruments (Reconciliation of Recurring Fair Value Measurements Recognized in Balance Sheet using Significant Unobservable (Level Three) Inputs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Values of Financial Instruments [Abstract]
Beginning balance	$ 3,336	$ 2,475
Total realized and unrealized gains (losses)
Included in other comprehensive income (loss)	714	(10)
Purchases, issuances and settlements	(7)
Ending balance	4	2,465
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date	$ 0	$ 0