Employee Benefit Plans (Plan Assets at Fair Value) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	$ 66,057	$ 72,296	$ 75,956
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	26,949	20,243
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	2,437	2,654
Cash And Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	2,437	2,654
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	14,023	4,029
Fixed Income [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	14,023	4,029
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		6,566
Equities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets		6,566
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	10,489	6,994
Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	10,489	6,994
Non-Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	26,949	20,243
Non-Closely Held Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	26,949	20,243
Equity Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	6,931	7,920
Hedge Fund Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	32,177	44,133
Closely Held Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan's assets	$ 39,108	$ 52,053