Stock-Based Compensation and Stock Repurchases (Summary of Restricted Stock Units Granted) (Details) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Sep. 30, 2017 shares
RSU Grants	138,691
Vested	43,398
Unvested	95,293
March 10, 2016 [Member]
RSU Grants	62,528
Vested	41,992
Unvested	20,536
April 11, 2016 [Member]
RSU Grants	5,625
Vested	1,406
Unvested	4,219
March 23, 2017 [Member]
RSU Grants	63,144
Unvested	63,144
August 29, 2017 [Member]
RSU Grants	7,394
Unvested	7,394
Director [Member]
RSU Grants	65,828
Director [Member] | March 10, 2016 [Member]
RSU Grants	35,147
Director [Member] | March 23, 2017 [Member]
RSU Grants	30,681
Management [Member]
RSU Grants	72,863
Management [Member] | March 10, 2016 [Member]
RSU Grants	27,381
Management [Member] | April 11, 2016 [Member]
RSU Grants	5,625
Management [Member] | March 23, 2017 [Member]
RSU Grants	32,463
Management [Member] | August 29, 2017 [Member]
RSU Grants	7,394