Stock Compensation Plans (Restricted Stock Unit Vesting) (Details) - Restricted Stock Units (RSUs) [Member]	Dec. 31, 2018 shares
2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting in future period	304,750
2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting in future period	176,250
2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting in future period	308,250
2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting in future period	789,250