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	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Values of Financial Instruments [Abstract]
Beginning balance	$ 2,534	$ 2,522
Ending balance	2,534	2,522
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