Pension (Plan Asset Allocation, Fair Value) (Details) (Defined Benefit Pension Plans and SERP, 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	$ 414,361	$ 403,249	$ 382,266
Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	355,829	343,018
Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	58,532	60,231	53,856
Cash & Cash Equivalents | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash & Cash Equivalents | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,327	11,136
Cash & Cash Equivalents | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Real Estate | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Real Estate | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17,332	14,543
Real Estate | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,224	5,105
Equity Securities | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity Securities | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	170,324	177,413
Equity Securities | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt Securities | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt Securities | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	157,846	139,926
Debt Securities | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Hedge Funds | Level One
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Hedge Funds | Level Two
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Hedge Funds | Level Three
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	54,308	55,126
Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	414,361	403,249
Total | Cash & Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,327	11,136
Total | Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,556	19,648
Total | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	170,324	177,413
Total | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	157,846	139,926
Total | Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 54,308	$ 55,126