Employee Benefit Plans (Plan Assets at Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 75,956	$ 72,617
Quoted Prices In Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23,753	21,523
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27,072	27,370
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25,131	23,724
Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,693	3,762
Cash And Cash Equivalents [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,693	3,762
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,824	4,000
Fixed Income [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,824	4,000
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,676
Equities [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,676
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,550	13,234
Mutual Funds [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,550	13,234
Equity Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,723	6,876
Equity Partnerships [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,723	6,876
Hedge Fund Investments: Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,010	527
Hedge Fund Investments: Cash [Member] | Quoted Prices In Active Markets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,010	527
Hedge Fund Investments: Long-Short Equity Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,633	26,221
Hedge Fund Investments: Long-Short Equity Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15,878	14,566
Hedge Fund Investments: Long-Short Equity Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,755	11,655
Hedge Fund Investments: Event Driven Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	13,033	14,680
Hedge Fund Investments: Event Driven Fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,471	5,928
Hedge Fund Investments: Event Driven Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,562	8,752
Hedge Fund Investment: Distressed Credit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,320	1,429
Hedge Fund Investment: Distressed Credit [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,320	1,429
Hedge Fund Investments: Multi-Strategy Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,494	1,888
Hedge Fund Investments: Multi-Strategy Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,494	1,888
Employee Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	75,956	72,617	66,137
Employee Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	25,131	23,724	21,653
Employee Pension Plans [Member] | Hedge Fund Investments: Long-Short Equity Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,755	10,863	9,992
Employee Pension Plans [Member] | Hedge Fund Investments: Event Driven Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,562	8,863	7,152
Employee Pension Plans [Member] | Hedge Fund Investment: Distressed Credit [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,320	2,199	2,559
Employee Pension Plans [Member] | Hedge Fund Investments: Multi-Strategy Fund [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,494	$ 1,799	$ 1,950