Employee Benefit Plans (Fair Values Of Pension Plan Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 235,297	$ 210,993	$ 247,583
Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,284	3,831
Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Large Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,036	20,295
Small Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Blended Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Mid Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Opportunistic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,480	15,461
Investment Grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62,134	51,340
Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,363	17,432
U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	81,209	70,059
Global Low Volatility
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,396	5,400
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	806
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	22
Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,742	8,623
Non-U.S. government and corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,504	13,569
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	301	3,782
Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		368
Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	234,419	206,250
Net Asset Value Per Share | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,284	3,831
Net Asset Value Per Share | Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Net Asset Value Per Share | Large Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Net Asset Value Per Share | International Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,036	20,295
Net Asset Value Per Share | Small Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Net Asset Value Per Share | Blended Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Net Asset Value Per Share | Mid Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Net Asset Value Per Share | Opportunistic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,480	15,461
Net Asset Value Per Share | Investment Grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62,134	51,340
Net Asset Value Per Share | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,363	17,432
Net Asset Value Per Share | Global Low Volatility
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,396	5,400
Net Asset Value Per Share | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Net Asset Value Per Share | Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,742	8,623
Net Asset Value Per Share | Non-U.S. government and corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,504	13,569
Net Asset Value Per Share | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	271	240
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	22
Fair Value, Inputs, Level 1 | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fair Value, Inputs, Level 1 | Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Large Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Small Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Blended Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Mid Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Opportunistic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Investment Grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	42	22
Fair Value, Inputs, Level 1 | Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Non-U.S. government and corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	836	3,910
Fair Value, Inputs, Level 2 | Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Large Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | International Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Small Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Blended Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Mid Cap Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Opportunistic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Investment Grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Non-U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | U.S. Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	806
Fair Value, Inputs, Level 2 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Non-U.S. government and corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 2 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30	3,542
Fair Value, Inputs, Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	368
Fair Value, Inputs, Level 1, 2 and 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 210,182