Employee Benefit Plans (Plan Assets at Fair Value) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		$ 73,357	$ 63,109	$ 71,541
Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		59,813	46,608
Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	[1]	13,544	16,501
Quoted prices in active markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		56,952	44,023
Quoted prices in active markets (Level 1) [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		56,952	44,023
Significant other observable inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		2,861	2,585
Significant other observable inputs (Level 2) [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		2,861	2,585
Cash and Cash Equivalents [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		2,867	7,587
Cash and Cash Equivalents [Member] | Quoted prices in active markets (Level 1) [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		2,867	7,587
Fixed Income Funds [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		2,861	2,585
Fixed Income Funds [Member] | Significant other observable inputs (Level 2) [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		2,861	2,585
Equity Funds [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		54,085	36,436
Equity Funds [Member] | Quoted prices in active markets (Level 1) [Member] | Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		54,085	36,436
Equity Partnerships [Member] | Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		3,660	5,580
Hedge Funds Investments [Member] | Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		$ 9,884	$ 10,921

[1] Closely held funds in private investment were comprised of a combination of Level 1, 2 and 3 investments, but were not categorized in the fair value hierarchy because they were measured at NAV using the practical expedient under ASC 820, Fair Value Measurement (“ASC 820”).