Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 13,306	$ 0
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	260
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,518
Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	10,528
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	13,306
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	260
Fair Value, Inputs, Level 1 [Member] | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,518
Fair Value, Inputs, Level 1 [Member] | Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	10,528
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 2 [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 2 [Member] | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 2 [Member] | Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 3 [Member] | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 3 [Member] | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0
Fair Value, Inputs, Level 3 [Member] | Mutual and other exchange traded funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 0