Retirement Plans (Fair Value of Plan Assets by Fair Value Level) (Details) (Pension Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost	$ (45)		$ 1,725		$ 1,419
Fair value of plan assets	130,775		128,829		98,187
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	121,918		117,562
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,857		11,267
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	130,775		128,829
Cash [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,594		902
Cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Cash [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Cash [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,594		902
U.S. large- and mid-cap stocks [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,718	[1]	56,015	[1]
U.S. large- and mid-cap stocks [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
U.S. large- and mid-cap stocks [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
U.S. large- and mid-cap stocks [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56,718	[1]	56,015
U.S. small-cap mutual funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,409		5,608
U.S. small-cap mutual funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
U.S. small-cap mutual funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
U.S. small-cap mutual funds [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,409		5,608
International large-cap mutual funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,805		15,504
International large-cap mutual funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
International large-cap mutual funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
International large-cap mutual funds [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14,805		15,504
Emerging markets mutual funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,004		6,360
Emerging markets mutual funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Emerging markets mutual funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Emerging markets mutual funds [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,004		6,360
Common Stock [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,455		6,672
Common Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Common Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Common Stock [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,455		6,672
U.S. Treasury and government sponsored agency bonds and notes [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	998		4,600
U.S. Treasury and government sponsored agency bonds and notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,043		2,574
U.S. Treasury and government sponsored agency bonds and notes [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
U.S. Treasury and government sponsored agency bonds and notes [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,041		7,174
Corporate bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,814	[2]	8,693	[2]
Corporate bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Corporate bonds [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,814	[2]	8,693
Mutual funds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,795	[3]	21,901	[3]
Mutual funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Mutual funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Mutual funds [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28,795	[3]	21,901	[3]
Other debt securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	140		0
Other debt securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Other debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Other debt securities [Member] | Fair Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 140		$ 0

[1] Comprised of common stocks and mutual funds traded on U.S. Exchanges whose issuers had market capitalizations exceeding $3 billion

[2] Comprised of investment grade bonds of U.S. issuers from diverse industries.

[3] Comprised primarily of fixed-income bonds issued by the U.S. Treasury and government sponsored agencies and bonds of U.S. and foreign issuers from diverse industries.